已解决：ListView 无法平滑滚动，即使使用 ViewHolder 也无法滚动 stucks/crashes
Solved: ListView not getting scrolled smoothly and it stucks/crashes while scrolling even with ViewHolder
在这里，我从网络服务中获取了大量数据，并且还附上了列表项的图像。但是当我滚动它时，我的 ListView 卡住了或崩溃了。如您所见，它有很多数据。我尝试了很多东西，但对我来说没有什么值得的。
MainActivity.java
lv = (ListView) findViewById(R.id.script_list);
lv.setScrollingCacheEnabled(false);
lv.setFastScrollEnabled(true);
//AsynTask
public class PostReview extends AsyncTask<Void, Void, String> {
ProgressBar progressBar;
String posted_by = "";
public PostReview(Context con, String item, ProgressBar progressBar) {
this.posted_by = item;
this.progressBar = progressBar;
}
//
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
/*pDialog = new ProgressDialog(ScriptViewClick.this, AlertDialog.THEME_HOLO_DARK);
pDialog.setMessage("Please Wait ..... ");
pDialog.setCancelable(false);
pDialog.show();*/
// progressBar.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(Void... params) {
return getString();
}
private String getString() {
// TODO Auto-generated method stub
String POST_PARAMS = "adivsor_id=" + posted_by;
URL obj = null;
HttpURLConnection con = null;
try {
obj = new URL(Constants.AppBaseUrl + "/advisor_calls/");
String userPassword = "rickmams" + ":" + "advisor11";
String header = "Basic " + new String(android.util.Base64.encode(userPassword.getBytes(), android.util.Base64.NO_WRAP));
con = (HttpURLConnection) obj.openConnection();
con.addRequestProperty("Authorization", header);
con.setRequestMethod("POST");
// For POST only - BEGIN
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
os.write(POST_PARAMS.getBytes());
os.flush();
os.close();
// For POST only - END
int responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { // success
BufferedReader in = new BufferedReader(new InputStreamReader(
con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
Log.i("TAG21", response.toString());
if (response.toString() != null) {
JSONObject jsonObject;
try {
jsonObject = new JSONObject(response.toString());
JSONArray js = jsonObject.getJSONArray("list");
for (int ii = 0; ii < js.length(); ii++) {
JSONObject c = js.getJSONObject(ii);
EquityDetails allDirectory = new EquityDetails();
allDirectory.setEntry_value(c.getString("entry"));
String value1 = c.getString("entry");
allDirectory.setCall_id(c.getString("call_id"));
String value2 = c.getString("tgt_1");
allDirectory.setSerial_value(c.getString("sl"));
allDirectory.setTg_value1(c.getString("tgt_1"));
allDirectory.setTg_value2(c.getString("tgt_2"));
allDirectory.setMainTitle_value(c.getString("script"));
allDirectory.setMain_subTitle_value(c.getString("exchange"));
allDirectory.setRating_value(c.getString("rating"));
allDirectory.setReview_value(c.getString("review"));
allDirectory.setPosted_by(c.getString("posted_by"));
allDirectory.setImage1(c.getString("advisor_image"));
allDirectory.setImage2(c.getString("script_image"));
allDirectory.setBuy(c.getString("buy_sentiment"));
allDirectory.setSell(c.getString("sell_sentiment"));
allDirectory.setRecommend(c.getString("recommendation"));
allDirectory.setPosted_date(c.getString("posted_date"));
allDirectory.setExpiry_date(c.getString("expiry_date"));
catListDao.add(allDirectory);
}
sca = new ScriptViewAdapter(getApplicationContext(), catListDao);
lv.setTranscriptMode(ListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
} catch (JSONException e) {
e.printStackTrace();
}
}
return response.toString();
} else {
Log.i("TAG12", "POST request did not work.");
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
lv.setAdapter(sca);
}
}
class
的 BaseAdapter
public ScriptViewAdapter(Context com, List<EquityDetails> list) {
this.con = com;
this.items = list;
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return items.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) con
.getSystemService(con.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.script, null);
holder = new ViewHolder();
holder.tv_rating_title = (TextView) convertView
.findViewById(R.id.script_tv_rating_title);
} else
holder = (ViewHolder) convertView.getTag();
Picasso.with(con)
.load(items.get(position).getImage1())
.into(holder.scriptView);
Picasso.with(con)
.load(items.get(position).getImage2())
.into(holder.advisoryView);
// new DownloadImageTask(holder.advisoryView).execute(items.get(position).getImage1());
// new DownloadImageTask(holder.scriptView).execute(items.get(position).getImage2());
return convertView;
}
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/percentage_text_top_margin"
android:background="@android:color/black"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:id="@+id/script_elements_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="2dp"
android:layout_marginTop="@dimen/percentage_text_top_margin"
android:orientation="horizontal">
<TextView
android:id="@+id/script_tv_element"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/et_topPadding"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_top_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_mcx"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_top_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_year"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text" />
<TextView
android:id="@+id/script_tv_rating"
android:layout_width="@dimen/rating_number_bg_width"
android:layout_height="@dimen/rating_number_bg_height"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:background="@drawable/rating_bg"
android:gravity="center"
android:paddingRight="5dp"
android:text="50"
android:textColor="#FCD730"
android:textSize="@dimen/home_screen_top_text" />
<TextView
android:id="@+id/script_tv_review_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:text=" Review "
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<RatingBar
android:id="@+id/script_rating"
android:layout_width="wrap_content"
android:layout_height="@dimen/rating_bar_height"
android:layout_gravity="center"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:clickable="false"
android:focusable="false"
android:isIndicator="true"
android:numStars="5"
android:progressDrawable="@drawable/custom_star_rating" />
<TextView
android:id="@+id/script_tv_rating_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Rating"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_rating_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:paddingLeft="5dp"
android:text="3"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/color_bg_drawer_first">
<ImageView
android:id="@+id/script_iv_logo"
android:layout_width="@dimen/home_screen_image_width"
android:layout_height="@dimen/home_screen_image_height"
android:layout_alignParentLeft="true"
android:layout_marginRight="5dp"
android:background="@drawable/script_img"
android:scaleType="fitXY" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/script_layout_company_images"
android:layout_toRightOf="@+id/script_iv_logo"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/tv_entry"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/entry"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_entry_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="105.35"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<View
android:layout_width="@dimen/view_line_width"
android:layout_height="@dimen/view_line_height"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="@color/text_color"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/tv_serial_line"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/serial"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_serial_line_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="452.00"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<View
android:layout_width="@dimen/view_line_width"
android:layout_height="@dimen/view_line_height"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="@color/text_color"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_tgt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/tgt"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_tgt_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="104"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
</LinearLayout>
<TextView
android:id="@+id/script_tv_sentimenst"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/edittext_side_margin"
android:text="@string/sentiments"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:id="@+id/script_layout_company_images"
android:layout_width="wrap_content"
android:layout_height="@dimen/home_screen_image_small_height"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/script_iv_icon_sell"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#ff1919"
android:gravity="center"
android:inputType="textCapCharacters"
android:text="recommedn"
android:textColor="#FFF"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<ImageView
android:id="@+id/script_iv_icon_company"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/small_script"
android:scaleType="fitXY" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="2dp"
android:background="@color/color_bg_drawer_first" />
</LinearLayout>
滚动时应用程序崩溃时的堆栈跟踪是
12-12 13:15:58.188 9104-9104/com.package E/filemap: mmap(0,154425) failed: Out of memory
12-12 13:15:58.188 9104-9104/com.package E/InputEventReceiver: Exception dispatching input event.
12-12 13:15:58.188 9104-9104/com.package E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
12-12 13:15:58.218 9104-9104/com.package E/MessageQueue-JNI: java.lang.RuntimeException: native typeface cannot be made
at android.graphics.Typeface.<init>(Typeface.java:334)
at android.graphics.Typeface.createFromAsset(Typeface.java:308)
at com.package.adapters.ScriptViewAdapter.getView(ScriptViewAdapter.java:116)
at android.widget.AbsListView.obtainView(AbsListView.java:2712)
at android.widget.ListView.makeAndAddView(ListView.java:1811)
at android.widget.ListView.fillDown(ListView.java:697)
at android.widget.ListView.fillGap(ListView.java:661)
at android.widget.AbsListView.trackMotionScroll(AbsListView.java:6686)
at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3920)
at android.widget.AbsListView.onTouchMove(AbsListView.java:4772)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:4600)
at android.view.View.dispatchTouchEvent(View.java:8135)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2140)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2295)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1622)
at android.app.Activity.dispatchTouchEvent(Activity.java:2565)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2243)
at android.view.View.dispatchPointerEvent(View.java:8343)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4767)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4633)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4245)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4214)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4325)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4222)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4382)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4245)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4214)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4222)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6556)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6473)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6444)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6409)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6636)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQue
Note: 图片大小为 128X66 和 259X194 像素。
确保图像尺寸没有变大并且应该可以正常渲染。
其次，不要一次性加载完整列表。每个人都喜欢阅读制作 10 条记录并在需要时按需加载。
它是一个列表视图，您可以在滚动时加载。
我总是强烈建议遵循一些标准，这可以使您的应用程序更快。
根据您发布的代码here:
- 将所有
setTypeFace 移动到 if 守卫中。这是一个非常昂贵的调用，您不需要在滚动期间连续进行。
- 避免在每次调用
getView 时实例化 SimpleDateFormat。最好以正确的格式提供数据集中的日期
- 将 ViewHolder 声明为静态的：
public static class ViewHolder
在这里，我从网络服务中获取了大量数据，并且还附上了列表项的图像。但是当我滚动它时，我的 ListView 卡住了或崩溃了。如您所见，它有很多数据。我尝试了很多东西，但对我来说没有什么值得的。
MainActivity.java
lv = (ListView) findViewById(R.id.script_list);
lv.setScrollingCacheEnabled(false);
lv.setFastScrollEnabled(true);
//AsynTask
public class PostReview extends AsyncTask<Void, Void, String> {
ProgressBar progressBar;
String posted_by = "";
public PostReview(Context con, String item, ProgressBar progressBar) {
this.posted_by = item;
this.progressBar = progressBar;
}
//
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
/*pDialog = new ProgressDialog(ScriptViewClick.this, AlertDialog.THEME_HOLO_DARK);
pDialog.setMessage("Please Wait ..... ");
pDialog.setCancelable(false);
pDialog.show();*/
// progressBar.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(Void... params) {
return getString();
}
private String getString() {
// TODO Auto-generated method stub
String POST_PARAMS = "adivsor_id=" + posted_by;
URL obj = null;
HttpURLConnection con = null;
try {
obj = new URL(Constants.AppBaseUrl + "/advisor_calls/");
String userPassword = "rickmams" + ":" + "advisor11";
String header = "Basic " + new String(android.util.Base64.encode(userPassword.getBytes(), android.util.Base64.NO_WRAP));
con = (HttpURLConnection) obj.openConnection();
con.addRequestProperty("Authorization", header);
con.setRequestMethod("POST");
// For POST only - BEGIN
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
os.write(POST_PARAMS.getBytes());
os.flush();
os.close();
// For POST only - END
int responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { // success
BufferedReader in = new BufferedReader(new InputStreamReader(
con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
Log.i("TAG21", response.toString());
if (response.toString() != null) {
JSONObject jsonObject;
try {
jsonObject = new JSONObject(response.toString());
JSONArray js = jsonObject.getJSONArray("list");
for (int ii = 0; ii < js.length(); ii++) {
JSONObject c = js.getJSONObject(ii);
EquityDetails allDirectory = new EquityDetails();
allDirectory.setEntry_value(c.getString("entry"));
String value1 = c.getString("entry");
allDirectory.setCall_id(c.getString("call_id"));
String value2 = c.getString("tgt_1");
allDirectory.setSerial_value(c.getString("sl"));
allDirectory.setTg_value1(c.getString("tgt_1"));
allDirectory.setTg_value2(c.getString("tgt_2"));
allDirectory.setMainTitle_value(c.getString("script"));
allDirectory.setMain_subTitle_value(c.getString("exchange"));
allDirectory.setRating_value(c.getString("rating"));
allDirectory.setReview_value(c.getString("review"));
allDirectory.setPosted_by(c.getString("posted_by"));
allDirectory.setImage1(c.getString("advisor_image"));
allDirectory.setImage2(c.getString("script_image"));
allDirectory.setBuy(c.getString("buy_sentiment"));
allDirectory.setSell(c.getString("sell_sentiment"));
allDirectory.setRecommend(c.getString("recommendation"));
allDirectory.setPosted_date(c.getString("posted_date"));
allDirectory.setExpiry_date(c.getString("expiry_date"));
catListDao.add(allDirectory);
}
sca = new ScriptViewAdapter(getApplicationContext(), catListDao);
lv.setTranscriptMode(ListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
} catch (JSONException e) {
e.printStackTrace();
}
}
return response.toString();
} else {
Log.i("TAG12", "POST request did not work.");
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
lv.setAdapter(sca);
}
}
class
的 BaseAdapter public ScriptViewAdapter(Context com, List<EquityDetails> list) {
this.con = com;
this.items = list;
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return items.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) con
.getSystemService(con.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.script, null);
holder = new ViewHolder();
holder.tv_rating_title = (TextView) convertView
.findViewById(R.id.script_tv_rating_title);
} else
holder = (ViewHolder) convertView.getTag();
Picasso.with(con)
.load(items.get(position).getImage1())
.into(holder.scriptView);
Picasso.with(con)
.load(items.get(position).getImage2())
.into(holder.advisoryView);
// new DownloadImageTask(holder.advisoryView).execute(items.get(position).getImage1());
// new DownloadImageTask(holder.scriptView).execute(items.get(position).getImage2());
return convertView;
}
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/percentage_text_top_margin"
android:background="@android:color/black"
android:gravity="center"
android:orientation="vertical">
<LinearLayout
android:id="@+id/script_elements_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="2dp"
android:layout_marginTop="@dimen/percentage_text_top_margin"
android:orientation="horizontal">
<TextView
android:id="@+id/script_tv_element"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/et_topPadding"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_top_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_mcx"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_top_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_year"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text" />
<TextView
android:id="@+id/script_tv_rating"
android:layout_width="@dimen/rating_number_bg_width"
android:layout_height="@dimen/rating_number_bg_height"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:background="@drawable/rating_bg"
android:gravity="center"
android:paddingRight="5dp"
android:text="50"
android:textColor="#FCD730"
android:textSize="@dimen/home_screen_top_text" />
<TextView
android:id="@+id/script_tv_review_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:text=" Review "
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<RatingBar
android:id="@+id/script_rating"
android:layout_width="wrap_content"
android:layout_height="@dimen/rating_bar_height"
android:layout_gravity="center"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:layout_marginRight="@dimen/percentage_text_top_margin"
android:clickable="false"
android:focusable="false"
android:isIndicator="true"
android:numStars="5"
android:progressDrawable="@drawable/custom_star_rating" />
<TextView
android:id="@+id/script_tv_rating_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Rating"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_rating_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/percentage_text_top_margin"
android:paddingLeft="5dp"
android:text="3"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/color_bg_drawer_first">
<ImageView
android:id="@+id/script_iv_logo"
android:layout_width="@dimen/home_screen_image_width"
android:layout_height="@dimen/home_screen_image_height"
android:layout_alignParentLeft="true"
android:layout_marginRight="5dp"
android:background="@drawable/script_img"
android:scaleType="fitXY" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/script_layout_company_images"
android:layout_toRightOf="@+id/script_iv_logo"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/tv_entry"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/entry"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_entry_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="105.35"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<View
android:layout_width="@dimen/view_line_width"
android:layout_height="@dimen/view_line_height"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="@color/text_color"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/tv_serial_line"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/serial"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_serial_line_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="452.00"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<View
android:layout_width="@dimen/view_line_width"
android:layout_height="@dimen/view_line_height"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="@color/text_color"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_tgt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/tgt"
android:textColor="@color/green"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<TextView
android:id="@+id/script_tv_tgt_value"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="2dp"
android:layout_weight="1"
android:text="104"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
</LinearLayout>
<TextView
android:id="@+id/script_tv_sentimenst"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/edittext_side_margin"
android:text="@string/sentiments"
android:textColor="@color/text_color"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold"
android:visibility="gone" />
</LinearLayout>
<LinearLayout
android:id="@+id/script_layout_company_images"
android:layout_width="wrap_content"
android:layout_height="@dimen/home_screen_image_small_height"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="horizontal"
android:weightSum="2">
<TextView
android:id="@+id/script_iv_icon_sell"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#ff1919"
android:gravity="center"
android:inputType="textCapCharacters"
android:text="recommedn"
android:textColor="#FFF"
android:textSize="@dimen/home_screen_main_text"
android:textStyle="bold" />
<ImageView
android:id="@+id/script_iv_icon_company"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/small_script"
android:scaleType="fitXY" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="2dp"
android:background="@color/color_bg_drawer_first" />
</LinearLayout>
滚动时应用程序崩溃时的堆栈跟踪是
12-12 13:15:58.188 9104-9104/com.package E/filemap: mmap(0,154425) failed: Out of memory
12-12 13:15:58.188 9104-9104/com.package E/InputEventReceiver: Exception dispatching input event.
12-12 13:15:58.188 9104-9104/com.package E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
12-12 13:15:58.218 9104-9104/com.package E/MessageQueue-JNI: java.lang.RuntimeException: native typeface cannot be made
at android.graphics.Typeface.<init>(Typeface.java:334)
at android.graphics.Typeface.createFromAsset(Typeface.java:308)
at com.package.adapters.ScriptViewAdapter.getView(ScriptViewAdapter.java:116)
at android.widget.AbsListView.obtainView(AbsListView.java:2712)
at android.widget.ListView.makeAndAddView(ListView.java:1811)
at android.widget.ListView.fillDown(ListView.java:697)
at android.widget.ListView.fillGap(ListView.java:661)
at android.widget.AbsListView.trackMotionScroll(AbsListView.java:6686)
at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3920)
at android.widget.AbsListView.onTouchMove(AbsListView.java:4772)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:4600)
at android.view.View.dispatchTouchEvent(View.java:8135)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2140)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2295)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1622)
at android.app.Activity.dispatchTouchEvent(Activity.java:2565)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2243)
at android.view.View.dispatchPointerEvent(View.java:8343)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4767)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4633)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4245)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4214)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4325)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4222)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4382)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4245)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4214)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4222)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4191)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6556)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6473)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6444)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6409)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6636)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQue
Note: 图片大小为 128X66 和 259X194 像素。
确保图像尺寸没有变大并且应该可以正常渲染。
其次，不要一次性加载完整列表。每个人都喜欢阅读制作 10 条记录并在需要时按需加载。
它是一个列表视图，您可以在滚动时加载。
我总是强烈建议遵循一些标准，这可以使您的应用程序更快。
根据您发布的代码here:
- 将所有
setTypeFace移动到if守卫中。这是一个非常昂贵的调用，您不需要在滚动期间连续进行。 - 避免在每次调用
getView时实例化SimpleDateFormat。最好以正确的格式提供数据集中的日期 - 将 ViewHolder 声明为静态的：
public static class ViewHolder