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Android開發(fā)之多線程中實現(xiàn)利用自定義控件繪制小球并完成小球自動下落功能實例

更新時間：2015年12月26日 12:08:28 作者：sgx425021234

這篇文章主要介紹了Android開發(fā)之多線程中實現(xiàn)利用自定義控件繪制小球并完成小球自動下落功能的方法,涉及Android多線程編程及圖形繪制相關(guān)技巧,需要的朋友可以參考下

本文實例講述了Android開發(fā)之多線程中實現(xiàn)利用自定義控件繪制小球并完成小球自動下落功能的方法。分享給大家供大家參考，具體如下：

1、布局界面

<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.csdn.net.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、封裝的一個繪制的圖的類

package www.csdn.net.tetris.domain;
import www.csdn.net.tetris.view.GameView;
public class Block {
 private int x=20,y=20;
 public GameView gameView;
 public Block(GameView gameView){
  this.gameView=gameView;
 }
 //向左移動
 public void moveLeft(){
  x-=10;
  gameView.invalidate();
 }
 //向右移動
 public void moveRight(){
  x+=10;
  gameView.invalidate();
 }
 //下落方法
  public void downLoad(){
   y+=10;
   gameView.invalidate();//重新繪制
  }
 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、創(chuàng)建一個畫布和線程的操作

package www.csdn.net.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.csdn.net.tetris.domain.Block;
public class GameView extends View {
 public static Block block;
 public Handler handler;
 //定義方向
 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);
  //創(chuàng)建俄羅斯方塊對象
  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;
    }
   }
  };
  //創(chuàng)建線程
  new Thread (new Runnable(){
   @Override
   public void run() {
    while(true){
     try{
      System.out.println("子線程名稱：：："+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);
  //設(shè)置了畫布的顏色
  canvas.drawARGB(255, 0, 0, 255);
  //設(shè)置一個畫筆
  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

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.csdn.net.tetris.domain.Block;
import www.csdn.net.tetris.view.GameView;
public class GameActivity extends Activity {
//聲明按鈕控件
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);
//獲取按鈕控件
btn_start=(Button) findViewById(R.id.btn_start);
btn_start.setOnClickListener(new MyOnClickListener());
System.out.println("主線程：：："+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);
//獲取控件
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, "向左移動", Toast.LENGTH_LONG).show();
GameView.block.moveLeft();
//GameView.dir=GameView.DIRLEFT;
break;
case R.id.btn_right:
Toast.makeText(GameActivity.this, "向右移動", Toast.LENGTH_LONG).show();
GameView.block.moveRight();
//GameView.dir=GameView.DIRRIGHT;
break;
default:
break;
}
}
}
}

希望本文所述對大家Android程序設(shè)計有所幫助。

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