java - Android onTouch 事件没有发生？

Question

我一直在研究并努力使用我的代码来获取 TextView ，以便在触摸“幽灵”时更新乐谱。

这是我的第一个 Android 应用程序，据我所知(我将 Log.w() 添加到 ontouch，但从未发布日志，分数也没有增加甚至出现)onTouch(View v , MotionEvent 事件)永远不会被调用。下面是我的代码。

package com.cs461.Ian;

//TODO:Add accelerometer support
//TODO:Add Clickable ghosts
//TODO:Add camera background
/*Completed:(As of 2:30am 4/16)
 * Activity launches
 * Ghost appears on screen
 * Ghost will randomly move around the screen
 */

import java.util.Random;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.TextView;

public class CameraActivity extends Activity{

Bitmap g;
Ghost a;
Ghost still;
SurfaceHolder mSurfaceHolder;
boolean firsttime=true;
int draw_x,draw_y,xSpeed,ySpeed,score=0;
TextView t;




@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.game);
    a = new Ghost(getApplicationContext());
    still = new Ghost(getApplicationContext());
    //requestWindowFeature(Window.FEATURE_NO_TITLE);
    a.Initalize(BitmapFactory.decodeResource(getResources(), R.drawable.ghost), 20, 20);
    still.Initalize(BitmapFactory.decodeResource(getResources(), R.drawable.ghost), 120, 120);
    t = (TextView) findViewById(R.id.t);
    t.setText("TEST SCORE TO SEE IF TEXTVIEW SHOWS UP");

    a.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN){
                score++;
                t.setText("Score: "+score);

            }
            return true;
        }
    });
    still.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN){
                score++;
                t.setText("Score: "+score);
                Log.w("CLICKED","Clicked on ghost "+score+" times");

            }
            return true;
        }
    });



    setContentView(new Panel(this));
}


class Panel extends View {
    public Panel(Context context) {
        super(context);
    }

    @Override
    public void onDraw(Canvas canvas) {
        //g.Initalise(BitmapFactory.decodeFile("/res/drawable-hdpi/ghost.png"), 200, 150, 5, 5);;
        update(canvas);
        invalidate();
    }

    /*Places ghost on screen and bounces it around in the screen. My phone is apparently only API level 4(the most up to date is 15) so i didn't code it
     *for the accelerometer yet.
     */
    public void update(Canvas canvas) {
        Random rand = new Random();
        if(firsttime){
            draw_x = Math.round(System.currentTimeMillis() % (this.getWidth()*2)) ;
            draw_y = Math.round(System.currentTimeMillis() % (this.getHeight()*2)) ;
            xSpeed = rand.nextInt(10);
            ySpeed = rand.nextInt(10);

            firsttime=false;
        }
         draw_x+=xSpeed;
         draw_y+=ySpeed;
        draw_x = Math.round(System.currentTimeMillis() % (this.getWidth()*2)) ;
        draw_y = Math.round(System.currentTimeMillis() % (this.getHeight()*2)) ;
         if (draw_x>this.getWidth()){
          draw_x = (this.getWidth()*2)-draw_x;
          xSpeed = rand.nextInt(10);
          if(xSpeed >=5)
              xSpeed=-xSpeed;
         }
         if (draw_y>this.getHeight()){
          draw_y = (this.getHeight()*2)-draw_y;
          ySpeed = rand.nextInt(10);
          if(ySpeed >=5)
              ySpeed=-ySpeed;
         }
         g = BitmapFactory.decodeResource(getResources(), R.drawable.ghost);
         canvas.drawBitmap(g, draw_x, draw_y, null);
         still.draw(canvas);
         a.update(canvas);


        }
    }


}

忘记添加类 Ghost:

package com.cs461.Ian;

import java.util.Random;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class Ghost extends View implements View.OnTouchListener{
public Ghost(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
}

private Bitmap mAnimation;
private int mXPos;
private int mYPos;
private Rect mSRectangle;
private int mSpriteHeight;
private int mSpriteWidth;
View v;
Rect dest;
int score = 0;

/*public Ghost() {
    mSRectangle = new Rect(0,0,0,0);
    mXPos = 80;
    mYPos = 200;
}*/



public void Initalize(Bitmap theBitmap, int Height, int Width) {
    mSRectangle = new Rect(0,0,0,0);
    mXPos = 80;
    mYPos = 200;
    mAnimation = theBitmap;
    mSpriteHeight = Height;
    mSpriteWidth = Width;
    mSRectangle.top = 0;
    mSRectangle.bottom = mSpriteHeight;
    mSRectangle.left = 0;
    mSRectangle.right = mSpriteWidth;
    dest = new Rect(mXPos, mYPos, mXPos + mSpriteWidth,
            mYPos + mSpriteHeight);

}
public void draw(Canvas canvas) {


    canvas.drawBitmap(mAnimation, mXPos, mYPos, null);
}

public void update(Canvas canvas) {
    new Random();

    mXPos = Math.round(System.currentTimeMillis() % (canvas.getWidth()*2)) ;
    mYPos = Math.round(System.currentTimeMillis() % (canvas.getHeight()*2)) ;
    if (mXPos>canvas.getWidth())
      mXPos = (canvas.getWidth()*2)-mXPos;
    if (mYPos>canvas.getHeight())
      mYPos = (canvas.getHeight()*2)-mYPos;

     draw(canvas);


}

public Rect getRect() {
    return mSRectangle;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
    score++;
    //CameraActivity.t.setText("Score: "+CameraActivity.score);
    Log.w("CLICKED","Clicked on ghost "+score+" times");
    return true; //doesn't work if returns false either
}


}

Answer 1

重写 Activity 中的 dispatchTouchEvent(MotionEvent event) 以处理所有可能发生的触摸事件。如果它们处理事件，则返回 false 将 MotionEvent 传递给层次结构中的下一个 View \布局。