如何在 Android 中设置 JSON 的另一个缩略图大小
How to set another thumbnail image size from JSON in Android
我想为一个站点开发应用程序，我从 JSON 读取站点数据。
我想在 Main 中显示标题和图像（缩略图） Activity 并在另一个 activity!
中显示标题、描述和图像（大尺寸）
主要Activity代码：
public class MainActivity extends AppCompatActivity {
private static final String TAG = "RecyclerViewExample";
private List<FeedItem> feedsList;
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize recycler view
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
// Downloading data from below url
final String url = "http://tellfa.com/tafrihgah/?json=get_posts";
new AsyncHttpTask().execute(url);
}
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected void onPreExecute() {
setProgressBarIndeterminateVisibility(true);
}
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
HttpURLConnection urlConnection;
try {
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200) {
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
} else {
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result; //"Failed to fetch data!";
}
@Override
protected void onPostExecute(Integer result) {
// Download complete. Let us update UI
progressBar.setVisibility(View.GONE);
if (result == 1) {
adapter = new MyRecyclerAdapter(MainActivity.this, feedsList);
mRecyclerView.setAdapter(adapter);
} else {
Toast.makeText(MainActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
}
}
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("posts");
feedsList = new ArrayList<>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("title"));
item.setThumbnail(post.optString("thumbnail"));
feedsList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
我的Json:
{
"status": "ok",
"count": 7,
"count_total": 7,
"pages": 1,
"posts": [{
"id": 47,
"type": "post",
"slug": "47",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=47",
"status": "publish",
"title": "",
"title_plain": "",
"content": "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<\/p>\n<p>bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb<\/p>\n<p>vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv<\/p>\n",
"excerpt": "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br \/>\nbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb<br \/>\nvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv<\/p>\n",
"date": "2016-04-13 07:15:18",
"modified": "2016-04-13 07:15:18",
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 7
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "tellfa",
"first_name": "",
"last_name": "",
"nickname": "tellfa",
"url": "",
"description": ""
},
"comments": [],
"attachments": [],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41.jpg",
"width": 1920,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-300x188.jpg",
"width": 300,
"height": 188
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-74x67.jpg",
"width": 74,
"height": 67
}
}
}, {
"id": 41,
"type": "post",
"slug": "dreams-home",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=41",
"status": "publish",
"title": "Dreams Home",
"title_plain": "Dreams Home",
"content": "<p>Graced with European flair, this striking one-story home shows off bay windows all over the home. Inside, the spacious kitchen serves the great room and breakfast nook with aplomb. The private master suite enjoys a spacious sitting area and double walk-in closets. On the opposite side of the home rest three secondary bedrooms, two dressed up with bay windows and the other with a private bath. There’s room in the garage for a golf cart or workshop. Click the home to see the layout.<\/p>\n",
"excerpt": "<p>Graced with European flair, this striking one-story home shows off bay windows all over the home. Inside, the spacious kitchen serves the great room and breakfast nook with aplomb. The private master suite enjoys a spacious sitting area and double walk-in closets. On the opposite <\/p>\n",
"date": "2016-03-11 13:26:51",
"modified": "2016-03-11 13:26:51",
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 7
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "tellfa",
"first_name": "",
"last_name": "",
"nickname": "tellfa",
"url": "",
"description": ""
},
"comments": [],
"attachments": [{
"id": 42,
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"slug": "w01-persiancamp1-com-14",
"title": "w01 - Persiancamp1.com (14)",
"description": "",
"caption": "",
"parent": 41,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-300x225.jpg",
"width": 300,
"height": 225
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-74x67.jpg",
"width": 74,
"height": 67
}
}
}],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-300x225.jpg",
"width": 300,
"height": 225
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-74x67.jpg",
"width": 74,
"height": 67
}
}
},
设置此代码时 item.setThumbnail(post.optString(**"thumbnail"**)); 没问题并显示为真，但我想显示大尺寸图像，例如："martial-frontpage-blog" , item.setThumbnail(post.optString(**"martial-frontpage-blog"**)); 当使用大尺寸时（martial-frontpage-blog from json）显示这个错误：
04-13 16:32:05.667 18720-18720/com.tellfa.testjson E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.tellfa.testjson, PID: 18720
java.lang.IllegalArgumentException: Path must not be empty.
at com.squareup.picasso.Picasso.load(Picasso.java:297)
at com.tellfa.testjson.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:39)
at com.tellfa.testjson.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:18)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5217)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5250)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4487)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1705)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1559)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1468)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2102)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1859)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1078)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5875)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5349)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
我总是检查你的代码和你的错误信息。在我看来，错误是由于 black URL 引起的。因为你的 JSON 解析不正确。
**JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("title"));
**// Change here
JSONObject images=post.getJSONObject("thumbnail_images");
JSONObject imagesPair=images.getJSONObject("martial-frontpage-blog");
item.setThumbnail(imagesPair.optString("url"));**
feedsList.add(item);**
我想为一个站点开发应用程序，我从 JSON 读取站点数据。
我想在 Main 中显示标题和图像（缩略图） Activity 并在另一个 activity!
中显示标题、描述和图像（大尺寸）
主要Activity代码：
public class MainActivity extends AppCompatActivity {
private static final String TAG = "RecyclerViewExample";
private List<FeedItem> feedsList;
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize recycler view
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
// Downloading data from below url
final String url = "http://tellfa.com/tafrihgah/?json=get_posts";
new AsyncHttpTask().execute(url);
}
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected void onPreExecute() {
setProgressBarIndeterminateVisibility(true);
}
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
HttpURLConnection urlConnection;
try {
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200) {
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
} else {
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result; //"Failed to fetch data!";
}
@Override
protected void onPostExecute(Integer result) {
// Download complete. Let us update UI
progressBar.setVisibility(View.GONE);
if (result == 1) {
adapter = new MyRecyclerAdapter(MainActivity.this, feedsList);
mRecyclerView.setAdapter(adapter);
} else {
Toast.makeText(MainActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
}
}
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("posts");
feedsList = new ArrayList<>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("title"));
item.setThumbnail(post.optString("thumbnail"));
feedsList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
我的Json:
{
"status": "ok",
"count": 7,
"count_total": 7,
"pages": 1,
"posts": [{
"id": 47,
"type": "post",
"slug": "47",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=47",
"status": "publish",
"title": "",
"title_plain": "",
"content": "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<\/p>\n<p>bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb<\/p>\n<p>vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv<\/p>\n",
"excerpt": "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br \/>\nbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb<br \/>\nvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv<\/p>\n",
"date": "2016-04-13 07:15:18",
"modified": "2016-04-13 07:15:18",
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 7
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "tellfa",
"first_name": "",
"last_name": "",
"nickname": "tellfa",
"url": "",
"description": ""
},
"comments": [],
"attachments": [],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41.jpg",
"width": 1920,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-300x188.jpg",
"width": 300,
"height": 188
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-41-74x67.jpg",
"width": 74,
"height": 67
}
}
}, {
"id": 41,
"type": "post",
"slug": "dreams-home",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=41",
"status": "publish",
"title": "Dreams Home",
"title_plain": "Dreams Home",
"content": "<p>Graced with European flair, this striking one-story home shows off bay windows all over the home. Inside, the spacious kitchen serves the great room and breakfast nook with aplomb. The private master suite enjoys a spacious sitting area and double walk-in closets. On the opposite side of the home rest three secondary bedrooms, two dressed up with bay windows and the other with a private bath. There’s room in the garage for a golf cart or workshop. Click the home to see the layout.<\/p>\n",
"excerpt": "<p>Graced with European flair, this striking one-story home shows off bay windows all over the home. Inside, the spacious kitchen serves the great room and breakfast nook with aplomb. The private master suite enjoys a spacious sitting area and double walk-in closets. On the opposite <\/p>\n",
"date": "2016-03-11 13:26:51",
"modified": "2016-03-11 13:26:51",
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 7
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "tellfa",
"first_name": "",
"last_name": "",
"nickname": "tellfa",
"url": "",
"description": ""
},
"comments": [],
"attachments": [{
"id": 42,
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"slug": "w01-persiancamp1-com-14",
"title": "w01 - Persiancamp1.com (14)",
"description": "",
"caption": "",
"parent": 41,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-300x225.jpg",
"width": 300,
"height": 225
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-74x67.jpg",
"width": 74,
"height": 67
}
}
}],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-300x225.jpg",
"width": 300,
"height": 225
},
"martial-frontpage-blog": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-771x376.jpg",
"width": 771,
"height": 376
},
"martial-blog-profile": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-371x267.jpg",
"width": 371,
"height": 267
},
"martial-blog-profile-thumb": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/03\/w01-Persiancamp1.com-14-74x67.jpg",
"width": 74,
"height": 67
}
}
},
设置此代码时 item.setThumbnail(post.optString(**"thumbnail"**)); 没问题并显示为真，但我想显示大尺寸图像，例如："martial-frontpage-blog" , item.setThumbnail(post.optString(**"martial-frontpage-blog"**)); 当使用大尺寸时（martial-frontpage-blog from json）显示这个错误：
04-13 16:32:05.667 18720-18720/com.tellfa.testjson E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.tellfa.testjson, PID: 18720
java.lang.IllegalArgumentException: Path must not be empty.
at com.squareup.picasso.Picasso.load(Picasso.java:297)
at com.tellfa.testjson.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:39)
at com.tellfa.testjson.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:18)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5217)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5250)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4487)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1705)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1559)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1468)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2102)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1859)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1078)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5875)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5349)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
我总是检查你的代码和你的错误信息。在我看来，错误是由于 black URL 引起的。因为你的 JSON 解析不正确。
**JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("title"));
**// Change here
JSONObject images=post.getJSONObject("thumbnail_images");
JSONObject imagesPair=images.getJSONObject("martial-frontpage-blog");
item.setThumbnail(imagesPair.optString("url"));**
feedsList.add(item);**