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Android - android.os.NetworkOnMainThreadException不幸的是，AppName的已經停止的時候我嘗試運行代碼的Twitter的Android
我按照網上http://codehenge.net/blog/2011/05/android-programming-tutorial-a-simple-twitter-feed-reader/ 我嘗試運行此示例代碼，但仿真器時打開應用程序，模擬器顯示警報對話框「不幸的是，AppName已停止」 Thx幫助>。 < Example.java
package facebook.appwall;
import java.net.URL;
import java.util.ArrayList;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class Example extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<Tweet> tweets = getTweets("android", 1);
ListView listView = (ListView) findViewById(R.id.ListViewId);
listView.setAdapter(new UserItemAdapter(this, R.layout.listitem1, tweets));
}
public class UserItemAdapter extends ArrayAdapter<Tweet> {
private ArrayList<Tweet> tweets;
public UserItemAdapter(Context context, int textViewResourceId, ArrayList<Tweet> tweets) {
super(context, textViewResourceId, tweets);
this.tweets = tweets;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.listitem1, null);
}
Tweet tweet = tweets.get(position);
if (tweet != null) {
TextView username = (TextView) v.findViewById(R.id.username);
TextView message = (TextView) v.findViewById(R.id.message);
ImageView image = (ImageView) v.findViewById(R.id.avatar);
if (username != null) {
username.setText(tweet.username);
}
if(message != null) {
message.setText(tweet.message);
}
if(image != null) {
image.setImageBitmap(getBitmap(tweet.image_url));
}
}
return v;
}
}
public Bitmap getBitmap(String bitmapUrl) {
try {
URL url = new URL(bitmapUrl);
return BitmapFactory.decodeStream(url.openConnection() .getInputStream());
}
catch(Exception ex) {return null;}
}
public ArrayList<Tweet> getTweets(String searchTerm, int page) {
String searchUrl = "http://search.twitter.com/[email protected]"
+ searchTerm + "&rpp=100&page=" + page;
ArrayList<Tweet> tweets = new ArrayList<Tweet>();
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(searchUrl);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = null;
try{
responseBody = client.execute(get, responseHandler);
}catch(Exception ex) {
ex.printStackTrace();
}
JSONObject jsonObject = null;
JSONParser parser=new JSONParser();
try {
Object obj = parser.parse(responseBody);
jsonObject=(JSONObject)obj;
}catch(Exception ex){
Log.v("TEST","Exception: " + ex.getMessage());
}
JSONArray arr = null;
try {
Object j = jsonObject.get("results");
arr = (JSONArray)j;
}catch(Exception ex){
Log.v("TEST","Exception: " + ex.getMessage());
}
for(Object t : arr) {
Tweet tweet = new Tweet(
((JSONObject)t).get("from_user").toString(),
((JSONObject)t).get("text").toString(),
((JSONObject)t).get("profile_image_url").toString()
);
tweets.add(tweet);
}
return tweets;
}
public class Tweet {
public String username;
public String message;
public String image_url;
public Tweet(String username, String message, String url) {
this.username = username;
this.message = message;
this.image_url = url;
}
}
}
main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView android:id="@+id/ListViewId"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
listview1.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:gravity="left|center"
android:layout_width="wrap_content"
android:paddingBottom="5px"
android:paddingTop="5px"
android:paddingLeft="5px">
<ImageView android:id="@+id/avatar"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_marginRight="6dip"
android:src="@drawable/ic_launcher"/>
<LinearLayout android:orientation="vertical"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="fill_parent">
<TextView android:id="@+id/username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"/>
<TextView android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10px"
android:textColor="#0099CC"/>
</LinearLayout>
</LinearLayout>
logcat的
12-18 22:32:32.562: E/dalvikvm(8406): Could not find class 'org.json.simple.parser.JSONParser', referenced from method facebook.appwall.Example.getTweets
12-18 22:32:32.582: W/dalvikvm(8406): VFY: unable to resolve new-instance 927 (Lorg/json/simple/parser/JSONParser;) in Lfacebook/appwall/Example;
12-18 22:32:32.582: D/dalvikvm(8406): VFY: replacing opcode 0x22 at 0x0040
12-18 22:32:32.592: D/dalvikvm(8406): DexOpt: unable to opt direct call 0x17ae at 0x42 in Lfacebook/appwall/Example;.getTweets
12-18 22:32:33.282: D/dalvikvm(8406): GC_CONCURRENT freed 111K, 8% free 2679K/2908K, paused 180ms+10ms, total 357ms
12-18 22:32:33.282: D/dalvikvm(8406): WAIT_FOR_CONCURRENT_GC blocked 159ms
12-18 22:32:33.292: I/dalvikvm-heap(8406): Grow heap (frag case) to 3.334MB for 635812-byte allocation
12-18 22:32:33.382: D/dalvikvm(8406): GC_FOR_ALLOC freed 4K, 7% free 3295K/3532K, paused 86ms, total 89ms
12-18 22:32:33.772: W/System.err(8406): android.os.NetworkOnMainThreadException
12-18 22:32:33.772: W/System.err(8406): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
12-18 22:32:33.792: W/System.err(8406): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
12-18 22:32:33.792: W/System.err(8406): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
12-18 22:32:33.801: W/System.err(8406): at java.net.InetAddress.getAllByName(InetAddress.java:214)
12-18 22:32:33.801: W/System.err(8406): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
12-18 22:32:33.812: W/System.err(8406): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-18 22:32:33.812: W/System.err(8406): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-18 22:32:33.812: W/System.err(8406): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
12-18 22:32:33.822: W/System.err(8406): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-18 22:32:33.833: W/System.err(8406): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
12-18 22:32:33.852: W/System.err(8406): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
12-18 22:32:33.852: W/System.err(8406): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
12-18 22:32:33.872: W/System.err(8406): at facebook.appwall.Example.getTweets(Example.java:102)
12-18 22:32:33.882: W/System.err(8406): at facebook.appwall.Example.onCreate(Example.java:37)
12-18 22:32:33.902: W/System.err(8406): at android.app.Activity.performCreate(Activity.java:5104)
12-18 22:32:33.902: W/System.err(8406): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-18 22:32:33.922: W/System.err(8406): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-18 22:32:33.922: W/System.err(8406): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-18 22:32:33.922: W/System.err(8406): at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-18 22:32:33.922: W/System.err(8406): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-18 22:32:33.942: W/System.err(8406): at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 22:32:33.942: W/System.err(8406): at android.os.Looper.loop(Looper.java:137)
12-18 22:32:33.952: W/System.err(8406): at android.app.ActivityThread.main(ActivityThread.java:5039)
12-18 22:32:33.962: W/System.err(8406): at java.lang.reflect.Method.invokeNative(Native Method)
12-18 22:32:33.962: W/System.err(8406): at java.lang.reflect.Method.invoke(Method.java:511)
12-18 22:32:33.973: W/System.err(8406): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-18 22:32:33.973: W/System.err(8406): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-18 22:32:33.992: W/System.err(8406): at dalvik.system.NativeStart.main(Native Method)
12-18 22:32:33.992: D/AndroidRuntime(8406): Shutting down VM
12-18 22:32:34.002: W/dalvikvm(8406): threadid=1: thread exiting with uncaught exception (group=0x40a70930)
12-18 22:32:34.062: E/AndroidRuntime(8406): FATAL EXCEPTION: main
12-18 22:32:34.062: E/AndroidRuntime(8406): java.lang.NoClassDefFoundError: org.json.simple.parser.JSONParser
12-18 22:32:34.062: E/AndroidRuntime(8406): at facebook.appwall.Example.getTweets(Example.java:108)
12-18 22:32:34.062: E/AndroidRuntime(8406): at facebook.appwall.Example.onCreate(Example.java:37)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.Activity.performCreate(Activity.java:5104)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.os.Looper.loop(Looper.java:137)
12-18 22:32:34.062: E/AndroidRuntime(8406): at android.app.ActivityThread.main(ActivityThread.java:5039)
12-18 22:32:34.062: E/AndroidRuntime(8406): at java.lang.reflect.Method.invokeNative(Native Method)
12-18 22:32:34.062: E/AndroidRuntime(8406): at java.lang.reflect.Method.invoke(Method.java:511)
12-18 22:32:34.062: E/AndroidRuntime(8406): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-18 22:32:34.062: E/AndroidRuntime(8406): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-18 22:32:34.062: E/AndroidRuntime(8406): at dalvik.system.NativeStart.main(Native Method)
** **搜索。 – njzk2