如何从列表视图 android 中获取值？
How to get values from listview android?
我是 android.I 的新手，正在从 mysql 获取数据并在 listview.things 中显示它工作正常，但现在我想在用户单击列表视图时将值传递给意图（行）。我已经实现了 setOnItemClickListener.but 列表视图是动态的，所以我不知道如何获取值并将其传递给意图。
提前致谢
public class AdminNotice extends Activity {
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private EditText editTextName;
SharedPreferences sp;
private String jsonResult;
private ListView listView;
private Button b;
EditText etname, et;
TextView tv;
String myJSON;
private static final String TAG = "MainActivity.java";
private static final String TAG_NAME = "notice";
private static final String TAG_DATE = "ndate";
ProgressBar progressBar;
Date date;
JSONArray peoples = null;
ArrayList<HashMap<String, String>> personList;
ListView list;
public static final String USER_NAME = "USERNAME";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.noticelist);
progressBar = (ProgressBar) findViewById(R.id.progressbar);
//SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
// String session_id= myprefs.getString("session_id", null);
//TextView textView = (TextView) findViewById(R.id.fname);
//textView.setText("Welcome "+session_id);
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
// load icons from
// strings.xml
list = (ListView) findViewById(R.id.listView);
personList = new ArrayList<HashMap<String,String>>();
getData();
}
//send messages stop
//get json data start
protected void showList(){
try {
JSONArray peoples = new JSONArray(myJSON);
for(int i=0;i<peoples.length();i++){
JSONObject c = peoples.getJSONObject(i);
String name=null, date=null;
/*if(c==null){
ProgressDialog progress = new ProgressDialog(this);
progress.setTitle("Loading");
progress.setMessage("Wait while loading...");
progress.show();
}*/
if(c.has("notice"))
if(c.has("ndate"))
progressBar.setVisibility(View.GONE);
name = c.getString("notice");
date = c.getString("ndate");
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_DATE,date);
personList.add(persons);
}
ListAdapter adapter = new SimpleAdapter(
AdminNotice.this, personList, R.layout.list_item1,
new String[]{TAG_NAME,TAG_DATE},
new int[]{R.id.name, R.id.date}
);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
/*ModelClass obj = getItem(position);
String name = obj.getName();*/
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
/* list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});*/
} catch (JSONException e) {
Log.i("tagconvertstr", "["+myJSON+"]");
}
}
public void getData(){
class GetDataJSON extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
String session_id= myprefs.getString("session_id", null);
InputStream inputStream = null;
String result = null;
try {
String postReceiverUrl = "http://notice.php";
// HttpClient
HttpClient httpClient = new DefaultHttpClient();
// post header
HttpPost httpPost = new HttpPost(postReceiverUrl);
// add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username", session_id));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
HttpEntity resEntity = response.getEntity();
inputStream = resEntity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.i("tagconvertstr", "["+result+"]");
System.out.println(e);
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
@Override
protected void onPostExecute(String result){
myJSON = result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
//get json data stop
}
在您的列表视图中 onItemClickListener
Intent intent=new Intent(currentyactivty.this,secondactiviy.class);
intent.putExtra("TAG_NAME", personList.get(position).get(TAG_NAME));
startActivity(intent);
在 onCreate 方法
中第二次 activity 获取数据
String data;
Intent in=getIntent();
if(in!=null && in.hasExtra("TAG_NAME")){
data=in.getStringArrayExtra("TAG_NAME");
}
您可以从视图中设置文本
list.setOnItemClickListener(新AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
Intent intent=new Intent(currentyactivty.this,secondactiviy.class);
intent.putExtra("NAME", personList.get(position).get(TAG_NAME));
startActivity(intent);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
/*ModelClass obj = getItem(position);
String name = obj.getName();*/
String personName = personList.get(position).get(TAG_NAME);
Intent i = new Intent(AdminNotice.this, YourNextActivity.class);
i.putExtra("person_name", personName);
startActivity(i);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
您可以使用 bundle 来传递来自 intent 的数据。
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
ModelClass obj = getItem(position);
String name = obj.getName();
String date = obj.getDate();
Bundle bundle = new Bundle();
bundle.putString("name", name);
bundle.putString("date", date );
Intent in = new Intent(currentActivity.this,destinationActivity.class);
in.putExtras(b);
startActivity(in);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
你可以通过这样做在你的另一个 activity 中得到它。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Intent in = getIntent();
Bundle b = in.getExtras();
String name = b.getString("name");
String date = b.getString("date);
}
使用这种方法，您不必再次访问数据库来检索数据，而且您的查询已被保存。
同样，如果需要，您也可以只发送 'id'。
但是如果你只想传递 'id' 那么@Nas 方法会更加有序和简单。
我是 android.I 的新手，正在从 mysql 获取数据并在 listview.things 中显示它工作正常，但现在我想在用户单击列表视图时将值传递给意图（行）。我已经实现了 setOnItemClickListener.but 列表视图是动态的，所以我不知道如何获取值并将其传递给意图。
提前致谢
public class AdminNotice extends Activity {
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private EditText editTextName;
SharedPreferences sp;
private String jsonResult;
private ListView listView;
private Button b;
EditText etname, et;
TextView tv;
String myJSON;
private static final String TAG = "MainActivity.java";
private static final String TAG_NAME = "notice";
private static final String TAG_DATE = "ndate";
ProgressBar progressBar;
Date date;
JSONArray peoples = null;
ArrayList<HashMap<String, String>> personList;
ListView list;
public static final String USER_NAME = "USERNAME";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.noticelist);
progressBar = (ProgressBar) findViewById(R.id.progressbar);
//SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
// String session_id= myprefs.getString("session_id", null);
//TextView textView = (TextView) findViewById(R.id.fname);
//textView.setText("Welcome "+session_id);
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
// load icons from
// strings.xml
list = (ListView) findViewById(R.id.listView);
personList = new ArrayList<HashMap<String,String>>();
getData();
}
//send messages stop
//get json data start
protected void showList(){
try {
JSONArray peoples = new JSONArray(myJSON);
for(int i=0;i<peoples.length();i++){
JSONObject c = peoples.getJSONObject(i);
String name=null, date=null;
/*if(c==null){
ProgressDialog progress = new ProgressDialog(this);
progress.setTitle("Loading");
progress.setMessage("Wait while loading...");
progress.show();
}*/
if(c.has("notice"))
if(c.has("ndate"))
progressBar.setVisibility(View.GONE);
name = c.getString("notice");
date = c.getString("ndate");
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_DATE,date);
personList.add(persons);
}
ListAdapter adapter = new SimpleAdapter(
AdminNotice.this, personList, R.layout.list_item1,
new String[]{TAG_NAME,TAG_DATE},
new int[]{R.id.name, R.id.date}
);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
/*ModelClass obj = getItem(position);
String name = obj.getName();*/
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
/* list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});*/
} catch (JSONException e) {
Log.i("tagconvertstr", "["+myJSON+"]");
}
}
public void getData(){
class GetDataJSON extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
String session_id= myprefs.getString("session_id", null);
InputStream inputStream = null;
String result = null;
try {
String postReceiverUrl = "http://notice.php";
// HttpClient
HttpClient httpClient = new DefaultHttpClient();
// post header
HttpPost httpPost = new HttpPost(postReceiverUrl);
// add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username", session_id));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
HttpEntity resEntity = response.getEntity();
inputStream = resEntity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.i("tagconvertstr", "["+result+"]");
System.out.println(e);
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
@Override
protected void onPostExecute(String result){
myJSON = result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
//get json data stop
}
在您的列表视图中 onItemClickListener
Intent intent=new Intent(currentyactivty.this,secondactiviy.class);
intent.putExtra("TAG_NAME", personList.get(position).get(TAG_NAME));
startActivity(intent);
在 onCreate 方法
中第二次 activity 获取数据String data;
Intent in=getIntent();
if(in!=null && in.hasExtra("TAG_NAME")){
data=in.getStringArrayExtra("TAG_NAME");
}
您可以从视图中设置文本 list.setOnItemClickListener(新AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
Intent intent=new Intent(currentyactivty.this,secondactiviy.class);
intent.putExtra("NAME", personList.get(position).get(TAG_NAME));
startActivity(intent);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
/*ModelClass obj = getItem(position);
String name = obj.getName();*/
String personName = personList.get(position).get(TAG_NAME);
Intent i = new Intent(AdminNotice.this, YourNextActivity.class);
i.putExtra("person_name", personName);
startActivity(i);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
您可以使用 bundle 来传递来自 intent 的数据。
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
ModelClass obj = getItem(position);
String name = obj.getName();
String date = obj.getDate();
Bundle bundle = new Bundle();
bundle.putString("name", name);
bundle.putString("date", date );
Intent in = new Intent(currentActivity.this,destinationActivity.class);
in.putExtras(b);
startActivity(in);
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
你可以通过这样做在你的另一个 activity 中得到它。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Intent in = getIntent();
Bundle b = in.getExtras();
String name = b.getString("name");
String date = b.getString("date);
}
使用这种方法，您不必再次访问数据库来检索数据，而且您的查询已被保存。
同样，如果需要，您也可以只发送 'id'。
但是如果你只想传递 'id' 那么@Nas 方法会更加有序和简单。