Android开发（14）-- 多线程中实现利用自定义控件绘制小球并完成小球自动下落的功能

1、布局界面

[html] view plain copy

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".GameActivity">
<www.youkuaiyun.com.tetris.view.GameView
android:id="@+id/gameview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/btn_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/gameview"
android:layout_alignParentBottom="true"
android:text="@string/btn_text"/>
<Button
android:id="@+id/btn_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/gameview"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text="@string/btn_right"/>
</RelativeLayout>

[html] view plain copy

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".GameActivity" >
<www.youkuaiyun.com.tetris.view.GameView
android:id="@+id/gameview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/btn_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/gameview"
android:layout_alignParentBottom="true"
android:text="@string/btn_text" />
<Button
android:id="@+id/btn_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/gameview"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text="@string/btn_right" />
</RelativeLayout>

2、封装的一个绘制的图的类

[java] view plain copy

package www.youkuaiyun.com.tetris.domain;
import www.youkuaiyun.com.tetris.view.GameView;
public class Block {
private int x=20,y=20;
public GameView gameView;
public Block(GameView gameView){
this.gameView=gameView;
}
//向左移动
public void moveLeft(){
x-=10;
gameView.invalidate();
}
//向右移动
public void moveRight(){
x+=10;
gameView.invalidate();
}
//下落方法
public void downLoad(){
y+=10;
gameView.invalidate();//重新绘制
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}

[java] view plain copy

package www.youkuaiyun.com.tetris.domain;
import www.youkuaiyun.com.tetris.view.GameView;
public class Block {
private int x=20,y=20;
public GameView gameView;
public Block(GameView gameView){
this.gameView=gameView;
}
//向左移动
public void moveLeft(){
x-=10;
gameView.invalidate();
}
//向右移动
public void moveRight(){
x+=10;
gameView.invalidate();
}
//下落方法
public void downLoad(){
y+=10;
gameView.invalidate();//重新绘制
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}

3、创建一个画布和线程的操作

[java] view plain copy

package www.youkuaiyun.com.tetris.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
import www.youkuaiyun.com.tetris.domain.Block;
public class GameViewextends View {
public static Block block;
public Handler handler;
//定义方向
public staticint dir=-1;
//上下左右
public staticfinal int DIRUP=1;
public staticfinal int DIRDOWN=2;
public staticfinal int DIRLEFT=3;
public staticfinal int DIRRIGHT=4;
public GameView(Context context,AttributeSet attrs) {
super(context);
//创建俄罗斯方块对象
this.block=new Block(this);
handler=new Handler(){
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case DIRLEFT:
GameView.block.moveLeft();
break;
case DIRRIGHT:
GameView.block.moveRight();
break;
default:
GameView.block.downLoad();
break;
}
}
};
//创建线程
new Thread (new Runnable(){
@Override
public void run() {
while(true){
try{
System.out.println("子线程名称：：："+Thread.currentThread().getName());
//block.downLoad();
Thread.sleep(1000);
handler.sendEmptyMessage(dir);
}catch(Exception e){
e.printStackTrace();
}
}
}
}).start();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//设置了画布的颜色
canvas.drawARGB(255, 0,0, 255);
//设置一个画笔
Paint paint=new Paint();
paint.setARGB(255,255, 0,0);
canvas.drawCircle(block.getX(), block.getY(), 10, paint);
}
}

[java] view plain copy

package www.youkuaiyun.com.tetris.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
import www.youkuaiyun.com.tetris.domain.Block;
public class GameView extends View {
public static Block block;
public Handler handler;
//定义方向
public static int dir=-1;
//上下左右
public static final int DIRUP=1;
public static final int DIRDOWN=2;
public static final int DIRLEFT=3;
public static final int DIRRIGHT=4;
public GameView(Context context,AttributeSet attrs) {
super(context);
//创建俄罗斯方块对象
this.block=new Block(this);
handler=new Handler(){
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case DIRLEFT:
GameView.block.moveLeft();
break;
case DIRRIGHT:
GameView.block.moveRight();
break;
default:
GameView.block.downLoad();
break;
}
}
};
//创建线程
new Thread (new Runnable(){
@Override
public void run() {
while(true){
try{
System.out.println("子线程名称：：："+Thread.currentThread().getName());
//block.downLoad();
Thread.sleep(1000);
handler.sendEmptyMessage(dir);
}catch(Exception e){
e.printStackTrace();
}
}
}
}).start();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//设置了画布的颜色
canvas.drawARGB(255, 0, 0, 255);
//设置一个画笔
Paint paint=new Paint();
paint.setARGB(255, 255, 0, 0);
canvas.drawCircle(block.getX(), block.getY(), 10, paint);
}
}

4、在MainActivity中的操作

[java] view plain copy

package com.example.tetris;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import www.youkuaiyun.com.tetris.domain.Block;
import www.youkuaiyun.com.tetris.view.GameView;
public class GameActivityextends Activity {
//声明按钮控件
public Button btn_start;
public Button btn_right;
public Button btn_left;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
//获取按钮控件
btn_start=(Button) findViewById(R.id.btn_start);
btn_start.setOnClickListener(new MyOnClickListener());
System.out.println("主线程：：："+Thread.currentThread().getName());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class MyOnClickListener implements View.OnClickListener{
@Override
public void onClick(View v) {
int id=v.getId();
switch (id) {
case R.id.btn_start:
//GameView gameView=new GameView(GameActivity.this,null);
GameActivity.this.setContentView(R.layout.activity_layout);
//获取控件
btn_right=(Button) findViewById(R.id.btn_right);
btn_left=(Button) findViewById(R.id.btn_left);
btn_left.setOnClickListener(new MyOnClickListener());
btn_right.setOnClickListener(new MyOnClickListener());
break;
case R.id.btn_left:
Toast.makeText(GameActivity.this,"向左移动", Toast.LENGTH_LONG).show();
GameView.block.moveLeft();
//GameView.dir=GameView.DIRLEFT;
break;
case R.id.btn_right:
Toast.makeText(GameActivity.this,"向右移动", Toast.LENGTH_LONG).show();
GameView.block.moveRight();
//GameView.dir=GameView.DIRRIGHT;
break;
default:
break;
}
}
}
}

Android开发（14）-- 多线程中实现利用自定义控件绘制小球并完成小球自动下落的功能

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