您好我正在创建一个显示图像的网格视图。我按照指南进行操作：http://javatechig.com/android/download-and-display-image-in-android-gridview
当我在android studio中运行我的代码时，我在logcat中收到了这些错误，我不知道如何修复：
07-10 12:21:30.057 5394-5394/com.javatechig.gridviewexample I/Choreographer﹕ Skipped 135 frames! The application may be doing too much work on its main thread.
07-10 12:21:30.588 5394-5406/com.javatechig.gridviewexample W/art﹕ Suspending all threads took: 26.488ms
07-10 12:21:30.646 5394-5406/com.javatechig.gridviewexample I/art﹕ Background partial concurrent mark sweep GC freed 588(77KB) AllocSpace objects, 5(176KB) LOS objects, 28% free, 10MB/14MB, paused 22.319ms total 36.654ms
07-10 12:21:31.984 5394-5394/com.javatechig.gridviewexample I/Choreographer﹕ Skipped 85 frames! The application may be doing too much work on its main thread.
07-10 12:21:32.650 5394-5401/com.javatechig.gridviewexample W/art﹕ Suspending all threads took: 396.475ms
07-10 12:21:32.697 5394-5394/com.javatechig.gridviewexample I/Choreographer﹕ Skipped 38 frames! The application may be doing too much work on its main thread.
07-10 12:21:33.120 5394-5406/com.javatechig.gridviewexample W/art﹕ Suspending all threads took: 9.729ms
07-10 12:21:35.202 5394-5394/com.javatechig.gridviewexample I/Choreographer﹕ Skipped 129 frames! The application may be doing too much work on its main thread.
07-10 12:21:36.205 5394-5394/com.javatechig.gridviewexample I/Choreographer﹕ Skipped 36 frames! The application may be doing too much work on its main thread.
07-10 12:23:32.286 5394-5401/com.javatechig.gridviewexample W/art﹕ Suspending all threads took: 10.405ms
07-10 12:25:23.268 5394-5401/com.javatechig.gridviewexample W/art﹕ Suspending all threads took: 5.947ms
这是我的代码：
package com.javatechig.gridviewexample;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class GridViewActivity extends ActionBarActivity {
private static final String TAG = GridViewActivity.class.getSimpleName();
private GridView mGridView;
private ProgressBar mProgressBar;
private GridViewAdapter mGridAdapter;
private ArrayList<GridItem> mGridData;
private String FEED_URL = "http://javatechig.com/?json=get_recent_posts&count=45";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gridview);
mGridView = (GridView) findViewById(R.id.gridView);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
//Initialize with empty data
mGridData = new ArrayList<>();
mGridAdapter = new GridViewAdapter(this, R.layout.grid_item_layout, mGridData);
mGridView.setAdapter(mGridAdapter);
//Grid view click event
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
//Get item at position
GridItem item = (GridItem) parent.getItemAtPosition(position);
Intent intent = new Intent(GridViewActivity.this, DetailsActivity.class);
ImageView imageView = (ImageView) v.findViewById(R.id.grid_item_image);
// Interesting data to pass across are the thumbnail size/location, the
// resourceId of the source bitmap, the picture description, and the
// orientation (to avoid returning back to an obsolete configuration if
// the device rotates again in the meantime)
int[] screenLocation = new int[2];
imageView.getLocationOnScreen(screenLocation);
//Pass the image title and url to DetailsActivity
intent.putExtra("left", screenLocation[0]).
putExtra("top", screenLocation[1]).
putExtra("width", imageView.getWidth()).
putExtra("height", imageView.getHeight()).
putExtra("title", item.getTitle()).
putExtra("image", item.getImage());
//Start details activity
startActivity(intent);
}
});
//Start download
new AsyncHttpTask().execute(FEED_URL);
mProgressBar.setVisibility(View.VISIBLE);
}
//Downloading data asynchronously
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
try {
// Create Apache HttpClient
HttpClient httpclient = new DefaultHttpClient();
HttpResponse httpResponse = httpclient.execute(new HttpGet(params[0]));
int statusCode = httpResponse.getStatusLine().getStatusCode();
// 200 represents HTTP OK
if (statusCode == 200) {
String response = streamToString(httpResponse.getEntity().getContent());
parseResult(response);
result = 1; // Successful
} else {
result = 0; //"Failed
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result;
}
@Override
protected void onPostExecute(Integer result) {
// Download complete. Lets update UI
if (result == 1) {
mGridAdapter.setGridData(mGridData);
} else {
Toast.makeText(GridViewActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
//Hide progressbar
mProgressBar.setVisibility(View.GONE);
}
}
String streamToString(InputStream stream) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
String line;
String result = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
// Close stream
if (null != stream) {
stream.close();
}
return result;
}
/**
* Parsing the feed results and get the list
*
* @param result
*/
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("posts");
GridItem item;
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
String title = post.optString("title");
item = new GridItem();
item.setTitle(title);
JSONArray attachments = post.getJSONArray("attachments");
if (null != attachments && attachments.length() > 0) {
JSONObject attachment = attachments.getJSONObject(0);
if (attachment != null)
item.setImage(attachment.getString("url"));
}
mGridData.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：1)
关于模拟器警告：The application may be doing too much work on its main thread.是正常的。忽略这些警告。