поместите изображение в зону прикосновения в android

Question

Мне нужно создать изображение, где пользователь коснулся экрана. Если пользователь касается большего количества мест, изображение должно отображаться во всех местах. Я использовал следующий код.

package com.tag.image; 

import android.app.Activity; 
import android.graphics.Canvas; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.Toast; 

public class TagsOverImage extends Activity { 
    /** Called when the activity is first created. */ 
    Canvas canvas ; 
    LinearLayout ll; 
    ImageView myImageView; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     ll=(LinearLayout)findViewById(R.id.lay_lin); 
     myImageView= new ImageView(this); 
    } 
    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     //ll.removeView(myImageView); 

     int x = (int)event.getX(); 
     int y = (int)event.getY(); 
     switch (event.getAction()) {    
      case MotionEvent.ACTION_DOWN:   
      myImageView.setImageResource(R.drawable.sample); 
      String text = "You click at x = " + event.getX() + " and y = " + event.getY(); 
      Toast.makeText(this, text, Toast.LENGTH_LONG).show(); 
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(50, 50); 
      params.setMargins(x,y, 0, 0); 
      myImageView.setLayoutParams(params); 
      ll.addView(myImageView); 

     }    
     return super.onTouchEvent(event);   
    } 
} 

И я получил следующую ошибку.

06-25 15:43:44.180: E/AndroidRuntime(2586): Uncaught handler: thread main exiting due to uncaught exception 
06-25 15:43:44.190: E/AndroidRuntime(2586): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.view.ViewGroup.addViewInner(ViewGroup.java:1946) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.view.ViewGroup.addView(ViewGroup.java:1841) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.view.ViewGroup.addView(ViewGroup.java:1798) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.view.ViewGroup.addView(ViewGroup.java:1778) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at com.tag.image.TagsOverImage.onTouchEvent(TagsOverImage.java:41) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.app.Activity.dispatchTouchEvent(Activity.java:2067) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.os.Looper.loop(Looper.java:123) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at android.app.ActivityThread.main(ActivityThread.java:4370) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-25 15:43:44.190: E/AndroidRuntime(2586):  at dalvik.system.NativeStart.main(Native Method) 
06-25 15:43:44.200: E/SemcCheckin(2586): Get crash dump level : java.io.FileNotFoundException: /data/semc-checkin/crashdump 

обновление:

использовал этот код в случае MotionEvent.ACTION_DOWN:

myImageView.setImageResource(R.drawable.sample); 
WindowManager windowsManager = (WindowManager) TagsOverImage.this.getSystemService(Context.WINDOW_SERVICE); 
WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams(); 
windowParams.x = (int) event.getX(); 
windowParams.y = (int) event.getY(); 
windowParams.height = myImageView.getHeight(); 
windowParams.width = myImageView.getWidth(); 
windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 
        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE 
        | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON 
        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN 
        | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS; 
windowParams.format = PixelFormat.TRANSLUCENT; 
windowParams.windowAnimations = 0; 
windowsManager.updateViewLayout(myImageView, windowParams); //error at this line 

получил следующее исключение в последней строке

06-25 17:10:05.320: E/AndroidRuntime(3511): Uncaught handler: thread main exiting due to uncaught exception 
06-25 17:10:05.330: E/AndroidRuntime(3511): java.lang.IllegalArgumentException: View not attached to window manager 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.view.WindowManagerImpl.updateViewLayout(WindowManagerImpl.java:191) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.view.Window$LocalWindowManager.updateViewLayout(Window.java:428) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at com.tag.image.TagsOverImage.onTouchEvent(TagsOverImage.java:63) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.app.Activity.dispatchTouchEvent(Activity.java:2067) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.os.Looper.loop(Looper.java:123) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at android.app.ActivityThread.main(ActivityThread.java:4370) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-25 17:10:05.330: E/AndroidRuntime(3511):  at dalvik.system.NativeStart.main(Native Method) 
06-25 17:10:05.340: E/SemcCheckin(3511): Get crash dump level : java.io.FileNotFoundException: /data/semc-checkin/crashdump 

---

Я попытался это link, и это работает для меня. http://eleanordarephdjournal.blogspot.in/2011/03/simplest-possible-android-graphic.html

Answer 1

Вам необходимо обновить позицию представления, а не просто добавить его снова.

Вот как это сделать:

WindowManager windowsManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE) 

WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams(); 
windowParams.x = <new X coord>; 
windowParams.y = <new Y coord> 
windowParams.height = myImageView.getHeight(); 
windowParams.width = myImageView.getWidth(); 
windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 
        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE 
        | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON 
        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN 
        | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS; 
windowParams.format = PixelFormat.TRANSLUCENT; 
      windowParams.windowAnimations = 0; 

windowManager.updateViewLayout(myImageView, windowParams);