我有一些問題,改變的ImageView的資源當我點擊一個項目的資源時,強行關閉。 我知道,任何圖形更新應該在UI線程來完成,我已經試過兩種方法都沒有成功:改變ImageView的
...我的代碼沒有一個處理程序:
public class AvatarPicker extends Activity {
ImageView iv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void clicked(View v){
iv = (ImageView) findViewById(v.getId());
iv.setImageResource(R.drawable.avatar_0);
}}
...我的一個代碼處理器和可運行:
public class AvatarPicker extends Activity {
ImageView iv;
private Handler mHandler;
private Runnable updateImg = new Runnable() {
@Override
public void run() {
iv.setImageResource(R.drawable.avatar_0);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mHandler = new Handler(){};
}
public void clicked(View v){
iv = (ImageView) findViewById(v.getId());
mHandler.post(updateImg);
}
}
我已在佈局XML的onClick
以「點擊」並給予所有的可點擊的圖像 唯一身份。當我把Log.d()幾乎在代碼中的任何地方,我都注意到它在iv.setImageResource(R.drawable.avatar_0);
命令處停止。
有人可以幫助我在這裏嗎?我錯過了什麼?由於
下面是一些額外的logcat信息:
06-17 19:23:09.877: INFO/ActivityManager(1184): Process com.google.android.apps.maps:FriendService (pid 4580) has died.
06-17 19:23:09.907: INFO/ActivityManager(1184): Displayed activity weldeborn.avatar/.AvatarPicker: 1008 ms (total 1008 ms)
06-17 19:23:10.077: DEBUG/ddm-heap(4602): Got feature list request
06-17 19:23:10.157: DEBUG/dalvikvm(1701): GC freed 2115 objects/112440 bytes in 99ms
06-17 19:23:12.607: DEBUG/AndroidRuntime(4602): Shutting down VM
06-17 19:23:12.607: WARN/dalvikvm(4602): threadid=3: thread exiting with uncaught exception (group=0x40026160)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): Uncaught handler: thread main exiting due to uncaught exception
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): java.lang.NullPointerException
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at weldeborn.avatar.AvatarPicker$1.run(AvatarPicker.java:21)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at android.os.Handler.handleCallback(Handler.java:587)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at android.os.Handler.dispatchMessage(Handler.java:92)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at android.os.Looper.loop(Looper.java:123)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at android.app.ActivityThread.main(ActivityThread.java:4370)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at java.lang.reflect.Method.invokeNative(Native Method)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at java.lang.reflect.Method.invoke(Method.java:521)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): at dalvik.system.NativeStart.main(Native Method)
06-17 19:23:12.627: ERROR/SemcCheckin(4602): Get crash dump level : java.io.FileNotFoundException: /data/semc-checkin/crashdump
06-17 19:23:12.627: WARN/ActivityManager(1184): Unable to start service Intent { act=com.sonyericsson.android.jcrashcatcher.action.BUGREPORT_AUTO cmp=com.sonyericsson.android.jcrashcatcher/.JCrashCatcherService (has extras) }: not found
06-17 19:23:12.627: INFO/Process(1184): Sending signal. PID: 4602 SIG: 3
06-17 19:23:12.627: INFO/dalvikvm(4602): threadid=7: reacting to signal 3
06-17 19:23:12.627: ERROR/dalvikvm(4602): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
06-17 19:23:12.667: ERROR/SemcCheckin(1687): Get Crash Level : java.io.FileNotFoundException: /data/semc-checkin/crashdump
06-17 19:23:15.557: DEBUG/WifiService(1184): ACTION_BATTERY_CHANGED pluggedType: 2
06-17 19:23:17.547: DEBUG/WifiService(1184): ACTION_BATTERY_CHANGED pluggedType: 2
06-17 19:23:22.707: DEBUG/dalvikvm(1852): GC freed 5128 objects/468256 bytes in 150ms
是正在橙/紅的第一行是這三個:
06-17 19:23:12.607: WARN/dalvikvm(4602): threadid=3: thread exiting with uncaught exception (group=0x40026160)
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): Uncaught handler: thread main exiting due to uncaught exception
06-17 19:23:12.617: ERROR/AndroidRuntime(4602): java.lang.NullPointerException
請發表您的例外 – Egor
的logcat的形象是什麼被點擊?你的ImageView或其他視圖?如上所述,請發佈您的LogCat。 – hooked82
有沒有更好的方法來粘貼LOGCAT信息...這是一種難以閱讀的方式。感謝您幫助 – Weldeborn