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下面的所有代码都可以按需要工作。也就是说，直到我尝试将第二个 onClickListener 添加到另一个图像。我尝试添加的代码以及我尝试添加它的位置在下面的代码中列为注释。有人看到我在这里遗漏的任何东西吗？我觉得这个额外的实现应该没有任何问题。

公共类 MainActivity 扩展 Activity {

ImageView mImage;
//ImageView journal;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mImage = (ImageView)MainActivity.this.findViewById(R.id.Floaterimg);
    //journal = (ImageView)MainActivity.this.findViewById(R.id.journbtn);

    //journal.setOnClickListener(new View.OnClickListener() {

        //@Override
        //public void onClick (View v) {
            //Intent i = new Intent(MainActivity.this, 
                            //SecondActivity.class);
            //startActivity(i);
        //}
    //});

    final Handler randomizer = new Handler();
    final Runnable rrandomizer = new Runnable() {
        public void run() {

            RelativeLayout.LayoutParams params = new 
                               LayoutParams(LayoutParams.WRAP_CONTENT, 
                               LayoutParams.WRAP_CONTENT);
            params.topMargin = (int)(Math.random()*2000 + 1);
            params.leftMargin = (int)(Math.random()*3000 + 1); 

            mImage.setLayoutParams(params);

            randomizer.postDelayed(this, 5000);
        }
    };
    rrandomizer.run();

    mImage.setOnClickListener(new View.OnClickListener() {
        int numClicks = 0;

        @Override
        public void onClick(View arg0) {
            numClicks++;
            if(numClicks > 5) {

                Bitmap bitmap = 
                                     BitmapFactory.decodeResource(getResources(), 
                                     R.drawable.ic_launcher);     
                ByteArrayOutputStream baos = new 
                                                  ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); 
                byte[] b = baos.toByteArray();

                Intent intent = new Intent(MainActivity.this, 
                                                             SecondActivity.class);
                intent.putExtra("picture", b);

                }
            }

        });
}

};

编辑：

按下按钮后来自 logcat 的错误：

10-18 14:17:32.529: E/InputDispatcher(17677): Event_report_payload: Failed to write keypress event to kernel, error = 5
10-18 14:17:32.529: E/dhcpcd(7483): open_udp_socket: No such device
10-18 14:17:32.549: E/dhcpcd(7483): open_socket: No such file or directory
10-18 14:17:32.549: E/dhcpcd(7483): send_raw_packet: No such file or directory
10-18 14:17:32.609: E/InputDispatcher(17677): Event_report_payload: Failed to write keypress event to kernel, error = 5
10-18 14:17:32.759: E/AndroidRuntime(26780): Uncaught handler: thread main exiting due to uncaught exception
10-18 14:17:32.759: E/Monkey(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.809: E/AndroidRuntime(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.809: E/AndroidRuntime(26780): FATAL EXCEPTION: main
10-18 14:17:32.809: E/AndroidRuntime(26780): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.SecondActivity}: java.lang.NullPointerException
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1664)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1680)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:945)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.os.Handler.dispatchMessage(Handler.java:99)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.os.Looper.loop(Looper.java:130)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread.main(ActivityThread.java:3719)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at java.lang.reflect.Method.invokeNative(Native Method)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at java.lang.reflect.Method.invoke(Method.java:507)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at dalvik.system.NativeStart.main(Native Method)
10-18 14:17:32.809: E/AndroidRuntime(26780): Caused by: java.lang.NullPointerException
10-18 14:17:32.809: E/AndroidRuntime(26780):    at com.example.inkuesttest.SecondActivity.onCreate(SecondActivity.java:18)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-18 14:17:32.809: E/AndroidRuntime(26780):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1628)
10-18 14:17:32.809: E/AndroidRuntime(26780):    ... 11 more
10-18 14:17:32.829: E/AndroidRuntime(26780): exception :java.io.FileNotFoundException: /dev/kmsg (Permission denied)
10-18 14:17:32.869: E/ActivityManager(17677): set systemprop back to original value~

编辑：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    Bundle extras = getIntent().getExtras();
//line18
    byte[] b = extras.getByteArray("picture");
//end line18

    Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.length);
    ImageView image = (ImageView) findViewById(R.id.imageView1);

    image.setImageBitmap(bmp);
}
}
4

1 回答 1

1

你的问题是你试图访问extras你的Intent，但你没有通过任何。你在Intent下面做这就是为什么那个工作

intent.putExtra("picture", b);

但你不会在你的 other 中这样做onClick()。你要么确保你正在发送extras，要么为了安全起见，用类似的东西null检查你的SecondActivity

  Bundle extras = getIntent().getExtras();
  //line18
  if (getIntent().getExtras() != null)
  {
      byte[] b = extras.getByteArray("picture");
  }

那么当然你需要处理下面的行，如果是的话null。

编辑

如果两个Buttons 通常会做同样的事情，那么您可以查看此答案以对两者使用相同的方法。然后，您只需switch根据单击id的内容使用不同的代码。View就像是

    @Override
    public void onClick(View v) {   // arg0 is an ugly name for a param so I changed it to v
       switch (v.getId())
       {
           case (R.id.Floaterimg):
              // do stuff if this image is clicked;
              break;
           case (R.id.journbtn):
              // do stuff if this image is clicked;
              break;
       }
}

然后把通用代码比如你的语句放在Intent外面。switch

于 2013-10-18T18:37:40.137 回答