androd事件处理简单介绍

控制飞机移动的简单实例

package peng.liu.test;import android.app.ActionBar;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.Display;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.Window;import android.view.WindowManager;public class MainActivity extends Activity{    int speed = 10;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        requestWindowFeature(Window.FEATURE_NO_TITLE);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);        final Plane plane = new Plane(this);        setContentView(plane);        plane.setBackgroundResource(Color.RED);        WindowManager manager = getWindowManager();        Display display = manager.getDefaultDisplay();        DisplayMetrics metrics = new DisplayMetrics();        display.getMetrics(metrics);        plane.currentX = metrics.widthPixels/2;        plane.currentY = metrics.heightPixels-40;        plane.setOnKeyListener(new View.OnKeyListener() {            @Override            public boolean onKey(View view, int i, KeyEvent keyEvent) {                switch(keyEvent.getKeyCode()){                    case KeyEvent.KEYCODE_S:                        plane.currentY+=speed;                        break;                    case KeyEvent.KEYCODE_W:                        plane.currentY-=speed;                        break;                    case KeyEvent.KEYCODE_A:                        plane.currentX-=speed;                        break;                    case KeyEvent.KEYCODE_D:                        plane.currentX+=speed;                        break;                }                plane.invalidate();                return true;            }        });    }}

package peng.liu.test;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.view.View;/** * Created by lplp on 2015/6/10. */public class Plane extends View {
          public float currentX,currentY;    public Bitmap plane;    public Plane(Context context){        super(context);        plane = BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_launcher);        setFocusable(true);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint p = new Paint();        canvas.drawBitmap(plane,currentX,currentY,p);    }}