Android的事件处理-android学习之旅（四十四）

androd事件处理简介

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);
    }
}