android事件监听器以及bitmap的运用

package com.example.dflenovo.plant;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.KeyEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

private int speed = 10;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);//去除标题
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
//        setContentView(R.layout.activity_main);
final Plant plant = new Plant(this);
setContentView(plant);
plant.setBackgroundResource(R.drawable.back);//设置背景
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();//获取窗体
DisplayMetrics displayMetrics = new DisplayMetrics();//获取屏幕分辨率
display.getMetrics(displayMetrics);
plant.countX = displayMetrics.widthPixels/2;//初始的宽度
plant.countY = displayMetrics.heightPixels-20;//初始的高度
plant.setOnKeyListener(new View.OnKeyListener() {//按钮的监听
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch(event.getKeyCode()){
case KeyEvent.KEYCODE_S:
plant.countY+=speed;
break;
case KeyEvent.KEYCODE_W:
plant.countY-=speed;
break;
case KeyEvent.KEYCODE_A:
plant.countX-=speed;
break;
case KeyEvent.KEYCODE_D:
plant.countX+=speed;
}
plant.invalidate();//图片的重绘
return true;

}
});
}
}

package com.example.dflenovo.plant;

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 DFLENOVO on 2016/3/26.
*/
public class Plant extends View {

public float countX;
public float countY;
Bitmap plane;
public Plant(Context context){
super(context);
plane = BitmapFactory.decodeResource(context.getResources(),R.drawable.plane);
setFocusable(true);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint p = new Paint();
canvas.drawBitmap(plane,countX,countY,p);
}

}

运行结束呢是用wsad来控制物体的移动，其中对于bitmap也有一点的运用，适合星空大战的游戏等，对于事件的运用比较的简单，与其他的监听差不多。