如何显示一个图像查看另一个图像？

Question

我有一个xml文件和2个图像views.the第一个图像视图显示了一个图像，填充screen.When我触摸屏幕我想第二个imageview出现在该位置。我可以实现这一目标？我使用frameLayout并试图在ontouch事件中设置第二个imageview的坐标，但它一直抛出一个错误。

我的XML文件

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" > 

<ImageView 
    android:id="@+id/SingleView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:scaleType="fitXY" /> 

<ImageView 
    android:id="@+id/touch" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/lock" 
    android:visibility="gone" /> 

</FrameLayout> 

我的Java文件

public class SingleViewActivity extends Activity { 
int position; 
String[] imageUrls; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
      WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    setContentView(R.layout.single_view); 
    File Path = getExternalFilesDir(null); 
    Constants cons = new Constants(); 
    imageUrls = cons.getImagePath(Path.toString()); 
    // Get intent data 
    Intent i = getIntent(); 

    // Selected image id 
    position = i.getExtras().getInt("position", -1); 
    ImageView imageView = (ImageView) findViewById(R.id.SingleView); 
    ImageLoader imageloader = ImageLoader.getInstance(); 
    imageloader.displayImage("file://" + imageUrls[position], imageView); 
} 

@SuppressWarnings("deprecation") 
public boolean onTouchEvent(MotionEvent event) { 
    // MotionEvent object holds X-Y values 
    if (event.getAction() == MotionEvent.ACTION_DOWN) { 
     final int XCood = (int) event.getX(); 
     final int YCood = (int) event.getY(); 
     ImageView touch = (ImageView) findViewById(R.id.touch); 
     touch.setLayoutParams(new AbsoluteLayout.LayoutParams(
       LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 
       XCood, YCood)); 
     touch.setVisibility(View.VISIBLE); 
    } 
    return false; 

} 

} 

logcat的

11-08 17:23:48.950: E/AndroidRuntime(1681): FATAL EXCEPTION: main 
11-08 17:23:48.950: E/AndroidRuntime(1681): Process: com.p3authentication, PID: 1681 
11-08 17:23:48.950: E/AndroidRuntime(1681): java.lang.ClassCastException: android.widget.AbsoluteLayout$LayoutParams cannot be cast to android.view.ViewGroup$MarginLayoutParams 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5116) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.View.measure(View.java:16521) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.View.measure(View.java:16521) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.View.measure(View.java:16521) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2552) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.View.measure(View.java:16521) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1915) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5603) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.Choreographer.doFrame(Choreographer.java:544) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.os.Handler.handleCallback(Handler.java:733) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.os.Handler.dispatchMessage(Handler.java:95) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.os.Looper.loop(Looper.java:136) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at android.app.ActivityThread.main(ActivityThread.java:5146) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at java.lang.reflect.Method.invoke(Method.java:515) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566) 
11-08 17:23:48.950: E/AndroidRuntime(1681):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

ImageView的父布局的FrameLayout所以你必须初始化的FrameLayout的LayoutParams和设置左和上边距将LayoutParams设置为第二个ImageView后，从X和Y坐标到LayoutParams您所示的第二ImageView的在触摸位置：

FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,FrameLayout.LayoutParams.WRAP_CONTENT); 
params.leftMargin = (int) event.getX(); 
params.topMargin = (int) event.getY(); 
touch.setLayoutParams(params); 

Formmated代码：

public class SingleViewActivity extends Activity { 

    private int position; 
    private String[] imageUrls; 
    private ImageView imageView; 
    private ImageView touch; 
    private ImageLoader imageloader; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.single_view); 
     imageView = (ImageView) findViewById(R.id.SingleView); 
     touch = (ImageView) findViewById(R.id.touch); 

     File Path = getExternalFilesDir(null); 
     Constants cons = new Constants(); 
     imageUrls = cons.getImagePath(Path.toString()); 
     // Get intent data 
     Intent i = getIntent(); 

     // Selected image id 
     position = i.getExtras().getInt("position", -1); 

     imageloader = ImageLoader.getInstance(); 
     imageloader.displayImage("file://" + imageUrls[position], imageView); 

     imageView.setOnTouchListener(new View.OnTouchListener() { 
      @Override 
      public boolean onTouch(View v, MotionEvent event) { 
       if (event.getAction() == MotionEvent.ACTION_DOWN) { 
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,FrameLayout.LayoutParams.WRAP_CONTENT); 
        params.leftMargin = (int) event.getX(); 
        params.topMargin = (int) event.getY(); 
        touch.setLayoutParams(params); 
        touch.setVisibility(View.VISIBLE); 
       } 
       return false; 
      } 
     }); 
    } 
}