Java 无法在网格视图中获取图像
Java 无法在网格视图中获取图像,java,android,gridview,Java,Android,Gridview,主要活动： public class MainActivity extends AppCompatActivity { // ImageView iv; public static StringBuffer finalparsedData; public static GridView myGrid; private static final String TAG = MainActivity.c
主要活动： public class MainActivity extends AppCompatActivity {
// ImageView iv;
public static StringBuffer finalparsedData;
public static GridView myGrid;
private static final String TAG = MainActivity.class.getSimpleName();
ArrayList<String> values = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myGrid=(GridView)findViewById(R.id.grid_view);
Button btnHit = (Button) findViewById(R.id.btnHit);
btnHit.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
new JSONTask().execute("https://api.flickr.com/services/rest/?method=flickr.photos.getRecent&" +
"api_key=46e71c8d2b35ba8c9c333a462ec8aea7&per_page=3&format=json&nojsoncallback=10");
}
});
values = new ArrayList<>();
}
/*static boolean isAirplaneModeOn(Context context) {
ContentResolver contentResolver = context.getContentResolver();
return Settings.System.getInt(contentResolver, AIRPLANE_MODE_ON, 0) != 0;
}*/
public class JSONTask extends AsyncTask<String, Void, String> {
String photoid;
int farm;
String server;
String secret;
@Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
StringBuffer buffer = null;
JSONArray parentarray = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson = buffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
//JSONObject initialObject = new JSONObject("photos");
JSONObject initialObject = parentObject.getJSONObject("photos");
parentarray = initialObject.getJSONArray("photo");
finalparsedData = new StringBuffer();
for (int i = 0; i < parentarray.length(); i++) {
JSONObject finalObject = parentarray.getJSONObject(i);
photoid = finalObject.optString("id");
farm = finalObject.optInt("farm");
server = finalObject.optString("server");
secret = finalObject.optString("secret");
finalparsedData.append("https://farm" + farm + ".staticflickr.com/" + server + "/" + photoid+ "_" + secret + ".jpg" +"\n\n");
values.add(String.valueOf((finalparsedData)));
}
return "done";
} catch (MalformedURLException e) {
e.printStackTrace();
return "error";
} catch (IOException e) {
e.printStackTrace();
return "error";
} catch (JSONException e) {
e.printStackTrace();
return "error";
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
return "done";
}
} catch (IOException e) {
e.printStackTrace();
return "error";
}
}
}
@Override
protected void onPostExecute(String result) {
switch (result){
case "done":
MyImageAdapter adapter = new MyImageAdapter(MainActivity.this, values);
myGrid.setAdapter((ListAdapter) adapter);
break;
}
}
}
}
public class MyImageAdapter extends BaseAdapter {
ArrayList<String> values;
Context mContext;
public MyImageAdapter(Context mContext, ArrayList<String> values) {
this.values = values;
this.mContext = mContext;
}
@Override
public int getCount() {
return values.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder;
;
if (row == null){
LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.grid,parent,false);
holder = new ViewHolder();
holder.imageView = (ImageView) row.findViewById(R.id.image_View);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
String image = values.get(position);
Picasso.with(mContext).load(image).into(holder.imageView);
return row;
}
public class ViewHolder {
ImageView imageView;
}
}
我在gridview中加载图像时遇到了一个问题，10张图像中只有1张显示，其余显示“此图像不再可用”哈哈哈，愚蠢的错误。用这个替换JSONTask中的for循环
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for (int i = 0; i < parentarray.length(); i++) {
JSONObject finalObject = parentarray.getJSONObject(i);
photoid = finalObject.optString("id");
farm = finalObject.optInt("farm");
server = finalObject.optString("server");
secret = finalObject.optString("secret");
String fullPath = "https://farm" + farm + ".staticflickr.com/" + server + "/" + photoid+ "_" + secret + ".jpg";
values.add(fullPath);
}
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对于（int i=0；i无需使用
StringBuffer字符串变量。：） 您是否从Api获取数据？如果是，则url可能无效。这意味着图像在此url上不可用。检查您正在获取的url的有效性。是的，我正在获取数据，并且url也是有效的。当我使用Log.d检查url时，它是每个图像的显示url，当我在浏览器中检查url时，它会显示图像。“这些图像不再可用”这意味着url不能公开使用。它们在浏览器中打开了吗？是的，图像在浏览器中是打开的，当我使用Log.d时，它的show Images url如下所示