在android中運行時應用程序崩潰？

Question

我正在android中製作一個小應用程序來放大圖像，但應用程序在運行時崩潰。這裏是代碼：

package new1.zoom; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.view.KeyEvent; 
import android.view.View; 


    public class newzoom extends View { 
     private Drawable image; 
     private int zoomControler=200; 
     public newzoom(Context context) 
     { 
     super(context); 
     image=context.getResources().getDrawable(R.drawable.me); 
     setFocusable(true); 
     } 
    @Override 
    protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
    //here u can control the width and height of the images........ this line is very important 
    image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler); 
    image.draw(canvas); 
    } 
    @Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// zoom in 
    zoomControler+=10; 
    if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // zoom out 
    zoomControler-=10; 
    if(zoomControler<10) 
    zoomControler=10; 
    invalidate(); 
    return true; 
    } 
    } 

任何人都可以幫我解決這個問題嗎？

這裏是我的logcat文件：

06-14 11:30:14.640: ERROR/AndroidRuntime(985): FATAL EXCEPTION: main 
06-14 11:30:14.640: ERROR/AndroidRuntime(985): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{new1.zoom/new1.zoom.newzoom}: java.lang.InstantiationException: new1.zoom.newzoom 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.os.Looper.loop(Looper.java:123) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at dalvik.system.NativeStart.main(Native Method) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985): Caused by: java.lang.InstantiationException: new1.zoom.newzoom 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at java.lang.Class.newInstanceImpl(Native Method) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at java.lang.Class.newInstance(Class.java:1429) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 
06-14 11:30:14.640: ERROR/AndroidRuntime(985):  ... 11 more 

Answer 1

請到通過給定鏈路。它使用多點觸摸並點擊縮放圖像：Android Multi touch zooming。在那裏有一個鏈接：http://blog.sephiroth.it/2011/04/04/imageview-zoom-and-scroll/它爲我工作。請嘗試這一點。