【发布时间】：2014-07-20 11:39:34
【问题描述】：
这是我的日志猫。不幸的是，我不是从 logcat 读取错误的专家，所以请帮助我:)
05-30 12:12:16.510: I/System.out(838): We made it this far 1
05-30 12:12:17.230: I/System.out(838): We made it this far 2
05-30 12:12:17.240: W/dalvikvm(838): VFY: unable to resolve exception class 748 (Lcom/fasterxml/jackson/core/JsonParseException;)
05-30 12:12:17.240: W/dalvikvm(838): VFY: unable to find exception handler at addr 0x2a
05-30 12:12:17.240: W/dalvikvm(838): VFY: rejected Lcom/example/bitmapdisplay/MainActivity$URLArray;.doInBackground ([Ljava/lang/Void;)Ljava/lang/Void;
05-30 12:12:17.240: W/dalvikvm(838): VFY: rejecting opcode 0x0d at 0x002a
05-30 12:12:17.250: W/dalvikvm(838): VFY: rejected Lcom/example/bitmapdisplay/MainActivity$URLArray;.doInBackground ([Ljava/lang/Void;)Ljava/lang/Void;
05-30 12:12:17.250: W/dalvikvm(838): Verifier rejected class Lcom/example/bitmapdisplay/MainActivity$URLArray;
05-30 12:12:17.250: D/AndroidRuntime(838): Shutting down VM
05-30 12:12:17.250: W/dalvikvm(838): threadid=1: thread exiting with uncaught exception (group=0xb1adaba8)
05-30 12:12:17.270: E/AndroidRuntime(838): FATAL EXCEPTION: main
05-30 12:12:17.270: E/AndroidRuntime(838): Process: com.example.bitmapdisplay, PID: 838
05-30 12:12:17.270: E/AndroidRuntime(838): java.lang.VerifyError: com/example/bitmapdisplay/MainActivity$URLArray
05-30 12:12:17.270: E/AndroidRuntime(838): at com.example.bitmapdisplay.MainActivity.onCreate(MainActivity.java:72)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.Activity.performCreate(Activity.java:5231)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.ActivityThread.access$800(ActivityThread.java:135)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.os.Handler.dispatchMessage(Handler.java:102)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.os.Looper.loop(Looper.java:136)
05-30 12:12:17.270: E/AndroidRuntime(838): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-30 12:12:17.270: E/AndroidRuntime(838): at java.lang.reflect.Method.invokeNative(Native Method)
05-30 12:12:17.270: E/AndroidRuntime(838): at java.lang.reflect.Method.invoke(Method.java:515)
05-30 12:12:17.270: E/AndroidRuntime(838): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-30 12:12:17.270: E/AndroidRuntime(838): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-30 12:12:17.270: E/AndroidRuntime(838): at dalvik.system.NativeStart.main(Native Method)
05-30 12:12:30.390: I/Process(838): Sending signal. PID: 838 SIG: 9
这是 logcat 代码，这是我的 Java 代码。似乎问题来自线程 URLArray，因为从 logcat 中可以看出，系统甚至没有打印第三个“我们做到了这一点”：
package com.example.bitmapdisplay;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import com.fasterxml.jackson.core.JsonParseException;
import android.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class MainActivity extends Activity {
/**
* Bitmap items na dimage displaying
*/
Bitmap image;
BitmapDrawable bd;
ImageView temp;
ProgressDialog pd;
/**
* JSON URL
*/
URL url;
/**
* Data from JSON file
*/
ArrayList<String> urls;
ArrayList<ImageView> images;
JsonParsing obj;
String json_link_str = "http://api.tumblr.com/v2/blog/humansofnewyork.com/posts?api_key=7ag2CJXOuxuW3vlVS5wQG6pYA6a2ZQcSCjzZsAp2pDbVwf3xEk¬es_info=true&filter=text";
int counter;
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println(" We made it this far 1");
super.onCreate(savedInstanceState);
setContentView(com.example.bitmapdisplay.R.layout.image_container);
counter = 0;
images = new ArrayList<ImageView>();
urls = new ArrayList<String>();
System.out.println(" We made it this far 2");
new URLArray().execute();
}
/**
* Fills the ListView
*/
private void fillGridView() {
ArrayAdapter<ImageView> adapter = new ArrayAdapter<ImageView>(this, com.example.bitmapdisplay.R.layout.image_container,images);
GridView grid = (GridView) findViewById(com.example.bitmapdisplay.R.id.gvImages);
grid.setAdapter(adapter);
}
public class URLArray extends AsyncTask<Void, Void, Void > {
public URLArray() {
}
@Override
protected Void doInBackground(Void...params ) {
try {
System.out.println(" We made it this far 3");
URL json_link = new URL(json_link_str);
JsonParsing parse_images = new JsonParsing(json_link);
try {
parse_images.parseFile(3, urls);
System.out.println(" We made it this far 4");
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
obj = parse_images;
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void arg) {
super.onPreExecute();
System.out.println(" We made it this far 5");
urls = obj.getURLs();
new TheTask().execute();
}
}
class TheTask extends AsyncTask<Void,Void,Void>
{
@Override
protected Void doInBackground(Void... params) {
System.out.println(" We made it this far 6");
pd = new ProgressDialog(MainActivity .this);
pd.show();
System.out.println(" We made it this far 7");
try
{
int counter = 0;
for (ImageView temp : images) {
image = downloadBitmap(urls.get(counter));
temp.setImageBitmap(image);
images.add(temp);
counter++;
}
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
System.out.println(" We made it this far 8");
super.onPostExecute(result);
pd.dismiss();
if(image!=null)
{
fillGridView();
}
}
}
private Bitmap downloadBitmap(String url) {
// initilize the default HTTP client object
final DefaultHttpClient client = new DefaultHttpClient();
//forming a HttoGet request
final HttpGet getRequest = new HttpGet(url);
try {
HttpResponse response = client.execute(getRequest);
//check 200 OK for success
final int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
Log.w("ImageDownloader", "Error " + statusCode +
" while retrieving bitmap from " + url);
return null;
}
final HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream inputStream = null;
try {
// getting contents from the stream
inputStream = entity.getContent();
// decoding stream data back into image Bitmap that android understands
image = BitmapFactory.decodeStream(inputStream);
} finally {
if (inputStream != null) {
inputStream.close();
}
entity.consumeContent();
}
}
} catch (Exception e) {
// You Could provide a more explicit error message for IOException
getRequest.abort();
Log.e("ImageDownloader", "Something went wrong while" +
" retrieving bitmap from " + url + e.toString());
}
return image;
}
}
【问题讨论】：
-
为什么会有空的
URLArray()构造函数？如果你把它拿出来会发生什么？ -
运行时加载
JsonParseException类时出现问题。请参阅stackoverflow.com/questions/100107/… 了解可能的原因。您很可能使用了错误版本的库。 -
@AdamJohns 我改变了它。没有区别：/
-
@matiash 我明白了。但是，我将在哪里更改运行时的库？对不起，我不擅长使用 logcat 来确定问题的确切位置和包。
-
问题可能与用作库的 jar 有关。请参阅stackoverflow.com/questions/6247862/… 了解可能的解决方案