Android 满屏显示自定义的View，并进行移动

时间：2022-11-07 18:46:06

新建一个类，继承View

package com.topcrab.mygame;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.util.AttributeSet;

import android.view.View;

import android.view.WindowManager;

/**

 * Created by Administrator on 2017-07-24.

 */

public class GameView extends View {

    Bitmap bitmap;

    int mapwidth;

    int mapheight;

    public int getRunleft() {

        return runleft;

    }

    public void setRunleft(int runleft) {

        this.runleft = runleft;

    }

    private int runleft;

    public int getRuntop() {

        return runtop;

    }

    public void setRuntop(int runtop) {

        this.runtop = runtop;

    }

    private int runtop;

    public GameView(Context context, AttributeSet set) {

        super(context, set);

        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.fly);

        mapheight = bitmap.getHeight();

        mapwidth = bitmap.getWidth();

    }

    @Override

    protected void onDraw(Canvas canvas) {

        canvas.drawBitmap(bitmap, runleft-mapwidth/2, runtop-mapheight/2, null);

        super.onDraw(canvas);

    }

}

默认加载页面

package com.topcrab.mygame;

import android.app.Activity;

import android.content.Context;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.DisplayMetrics;

import android.view.MotionEvent;

import android.view.Window;

import android.view.WindowManager;

public class MainActivity extends Activity {

    GameView gameView=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //屏幕无标题

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        //全屏显示

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);

        gameView=(GameView) findViewById(R.id.GameId);

        //获取屏幕宽度和高度

        WindowManager manager = this.getWindowManager();

        DisplayMetrics outMetrics = new DisplayMetrics();

        manager.getDefaultDisplay().getMetrics(outMetrics);

        int width = outMetrics.widthPixels;

        int height = outMetrics.heightPixels;

        //设置飞机初始状态时的位置

        gameView.setRuntop(height-100);

        gameView.setRunleft(width/2);

    }

    //屏幕触碰事件

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        float left=event.getX();

        float top=event.getY();

        gameView.setRunleft((int)left);

        gameView.setRuntop((int)top);

        gameView.invalidate();

        return super.onTouchEvent(event);

    }

}

xml文件

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.topcrab.mygame.MainActivity">

    <com.topcrab.mygame.GameView

        android:id="@+id/GameId"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

</android.support.constraint.ConstraintLayout>

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