添加手勢支持後Android崩潰

Question

我的應用運行良好，albiet沒有功能，但由於我添加了對手勢的支持（代碼由教程改編），現在只是在運行時崩潰。

package com.mystraldesign.memorable; 

import android.app.Activity; 
//import android.gesture.GestureOverlayView; 
import android.gesture.GestureOverlayView; 
import android.gesture.GestureOverlayView.OnGestureListener; 
import android.graphics.Typeface; 
import android.os.Bundle; 
//import android.widget.RelativeLayout; 
import android.view.GestureDetector; 
import android.view.GestureDetector.OnDoubleTapListener; 
import android.view.MotionEvent; 
import android.view.Window; 
import android.widget.TextView; 

public class MemorableActivity extends Activity implements OnGestureListener,OnDoubleTapListener 
{ 
    //Define text views 
    private TextView textView1; 
    private TextView textView2; 
    private TextView textView3; 
    private TextView textView4; 

    //Gesture Detectors 
    private GestureDetector gTap; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     gTap = new GestureDetector(this,(android.view.GestureDetector.OnGestureListener) this); 

     //Remove title bar 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.main); 




     //Define textView 
     textView1 = (TextView) findViewById(R.id.textView1); 
     textView2 = (TextView) findViewById(R.id.textView2); 
     textView3 = (TextView) findViewById(R.id.textView3); 
     textView4 = (TextView) findViewById(R.id.textView4); 

     //Load font file 
     Typeface type = Typeface.createFromAsset(getAssets(),"fonts/optima.ttf"); 

     //Set various textViews to font 
     textView1.setTypeface(type); 
     textView2.setTypeface(type); 
     textView3.setTypeface(type); 
     textView4.setTypeface(type); 


    } 



    public boolean onTouchEvent(MotionEvent me){ 
     this.gTap.onTouchEvent(me); 
    return super.onTouchEvent(me); 
    } 

    public boolean onDown(MotionEvent e) { 
     textView1.setText("Down"); 
     return false; 
    } 

    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
     float velocityY) { 
     textView1.setText("Fling"); 
     return false; 
    } 


    public void onLongPress(MotionEvent e) { 
     textView1.setText("Long Press"); 
    } 


    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, 
     float distanceY) { 
     textView1.setText("Scroll"); 
    return false; 
    } 


    public void onShowPress(MotionEvent e) { 
     textView1.setText("Show Press"); 
    } 

    public boolean onSingleTapUp(MotionEvent e) { 
     textView1.setText("Sing Tap Up"); 
    return false; 
    } 

    public boolean onDoubleTap(MotionEvent e) { 
     textView1.setText("Double Tap"); 
    return false; 
    } 

    public boolean onDoubleTapEvent(MotionEvent e) { 
     textView1.setText("Double Tap Event"); 
     return false; 
    } 

    public boolean onSingleTapConfirmed(MotionEvent e) { 
     textView1.setText("Single Tap Confirmed"); 
    return false; 
    } 




} 

我除了各的方法，比如Eclipse的開始@override statment說明了他們的錯誤，並給出了自動修復被刪除@override語句。

這也給了一個錯誤的public class MemorableActivity extends Activity implements OnGestureListener,OnDoubleTapListener行是：

Multiple markers at this line 
    - The type MemorableActivity must implement the inherited abstract method 
    GestureOverlayView.OnGestureListener.onGestureEnded(GestureOverlayView, MotionEvent) 
    - The type MemorableActivity must implement the inherited abstract method 
    GestureOverlayView.OnGestureListener.onGestureCancelled(GestureOverlayView, MotionEvent) 
    - The type MemorableActivity must implement the inherited abstract method 
    GestureOverlayView.OnGestureListener.onGestureStarted(GestureOverlayView, MotionEvent) 
    - The type MemorableActivity must implement the inherited abstract method 
    GestureOverlayView.OnGestureListener.onGesture(GestureOverlayView, MotionEvent) 

它提出的

Add unimplemented methods 
Make MemorableActivity abstract 
Rename in file 
Rename in workspace 

我試了前兩個補丁，但它仍然崩潰，我不知道第二個和第三個是/做什麼。

的似乎並沒有在日誌中任何東西，但這裏是從控制檯

[2012-04-30 03:54:37 - Memorable] ------------------------------ 
[2012-04-30 03:54:37 - Memorable] Android Launch! 
[2012-04-30 03:54:37 - Memorable] adb is running normally. 
[2012-04-30 03:54:38 - Memorable] Performing com.mystraldesign.memorable.MemorableActivity activity launch 
[2012-04-30 03:54:38 - Memorable] Automatic Target Mode: launching new emulator with compatible AVD 'Memorable' 
[2012-04-30 03:54:38 - Memorable] Launching a new emulator with Virtual Device 'Memorable' 
[2012-04-30 03:54:44 - Emulator] 2012-04-30 03:54:44.155 emulator-arm[2796:1107] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz. 
[2012-04-30 03:54:44 - Memorable] New emulator found: emulator-5554 
[2012-04-30 03:54:44 - Memorable] Waiting for HOME ('android.process.acore') to be launched... 
[2012-04-30 03:55:36 - Memorable] HOME is up on device 'emulator-5554' 
[2012-04-30 03:55:36 - Memorable] Uploading Memorable.apk onto device 'emulator-5554' 
[2012-04-30 03:55:41 - Memorable] Installing Memorable.apk... 
[2012-04-30 03:55:57 - Memorable] Success! 
[2012-04-30 03:55:57 - Memorable] Starting activity com.mystraldesign.memorable.MemorableActivity on device emulator-5554 
[2012-04-30 03:56:00 - Memorable] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.mystraldesign.memorable/.MemorableActivity } 

編輯輸出：

添加日誌從Eclipse的

04-30 05:43:25.339: D/AndroidRuntime(333): Shutting down VM 
04-30 05:43:25.339: W/dalvikvm(333): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
04-30 05:43:25.369: E/AndroidRuntime(333): FATAL EXCEPTION: main 
04-30 05:43:25.369: E/AndroidRuntime(333): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mystraldesign.memorable/com.mystraldesign.memorable.MemorableActivity}: java.lang.ClassCastException: com.mystraldesign.memorable.MemorableActivity 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.os.Looper.loop(Looper.java:123) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-30 05:43:25.369: E/AndroidRuntime(333): at java.lang.reflect.Method.invokeNative(Native Method) 
04-30 05:43:25.369: E/AndroidRuntime(333): at java.lang.reflect.Method.invoke(Method.java:507) 
04-30 05:43:25.369: E/AndroidRuntime(333): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-30 05:43:25.369: E/AndroidRuntime(333): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-30 05:43:25.369: E/AndroidRuntime(333): at dalvik.system.NativeStart.main(Native Method) 
04-30 05:43:25.369: E/AndroidRuntime(333): Caused by: java.lang.ClassCastException: com.mystraldesign.memorable.MemorableActivity 
04-30 05:43:25.369: E/AndroidRuntime(333): at com.mystraldesign.memorable.MemorableActivity.onCreate(MemorableActivity.java:33) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-30 05:43:25.369: E/AndroidRuntime(333): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
04-30 05:43:25.369: E/AndroidRuntime(333): ... 11 more 

Answer 1

要實現一個類型OnGestureListener，但鑄造到另一個。將您的Activity類聲明更改爲：

public class MemorableActivity extends Activity implements android.view.GestureDetector.OnGestureListener,OnDoubleTapListener 

然後執行必要的方法，並且您的崩潰應該停止發生。