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 plaincopyprint?

1. <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2. xmlns:tools="http://schemas.android.com/tools"
3. android:layout_width="match_parent"
4. android:layout_height="match_parent"
5. android:paddingBottom="@dimen/activity_vertical_margin"
6. android:paddingLeft="@dimen/activity_horizontal_margin"
7. android:paddingRight="@dimen/activity_horizontal_margin"
8. android:paddingTop="@dimen/activity_vertical_margin"
9. tools:context=".GameActivity">
12. <www.csdn.net.tetris.view.GameView
13. android:id="@+id/gameview"
14. android:layout_width="wrap_content"
15. android:layout_height="wrap_content"/>
17. <Button
18. android:id="@+id/btn_left"
19. android:layout_width="wrap_content"
20. android:layout_height="wrap_content"
21. android:layout_alignLeft="@+id/gameview"
22. android:layout_alignParentBottom="true"
23. android:text="@string/btn_text"/>
25. <Button
26. android:id="@+id/btn_right"
27. android:layout_width="wrap_content"
28. android:layout_height="wrap_content"
29. android:layout_alignBottom="@+id/gameview"
30. android:layout_centerHorizontal="true"
31. android:layout_alignParentBottom="true"
32. android:text="@string/btn_right"/>
36. </RelativeLayout>

<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、封装的一个绘制的图的类

[java] view plaincopyprint?

1. package www.csdn.net.tetris.domain;
3. import www.csdn.net.tetris.view.GameView;
5. public class Block {
7. private int x=20,y=20;
10. public GameView gameView;
11. public Block(GameView gameView){
12. this.gameView=gameView;
13. }
17. //向左移动
18. public void moveLeft(){
19. x-=10;
20. gameView.invalidate();
21. }
23. //向右移动
24. public void moveRight(){
25. x+=10;
26. gameView.invalidate();
27. }
29. //下落方法
30. public void downLoad(){
31. y+=10;
32. gameView.invalidate();//重新绘制
33. }
35. public int getX() {
36. return x;
37. }
39. public void setX(int x) {
40. this.x = x;
41. }
43. public int getY() {
44. return y;
45. }
47. public void setY(int y) {
48. this.y = y;
49. }
52. }

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 plaincopyprint?

1. package www.csdn.net.tetris.view;
3. import android.content.Context;
4. import android.graphics.Canvas;
5. import android.graphics.Paint;
6. import android.os.Handler;
7. import android.os.Message;
8. import android.util.AttributeSet;
9. import android.view.View;
10. import www.csdn.net.tetris.domain.Block;
12. public class GameViewextends View {
14. public static Block block;
16. public Handler handler;
17. //定义方向
18. public staticint dir=-1;
19. //上下左右
20. public staticfinal int DIRUP=1;
21. public staticfinal int DIRDOWN=2;
22. public staticfinal int DIRLEFT=3;
23. public staticfinal int DIRRIGHT=4;
25. public GameView(Context context,AttributeSet attrs) {
26. super(context);
27. //创建俄罗斯方块对象
28. this.block=new Block(this);
31. handler=new Handler(){
32. public void handleMessage(Message msg) {
33. super.handleMessage(msg);
34. switch (msg.what) {
35. case DIRLEFT:
36. GameView.block.moveLeft();
37. break;
38. case DIRRIGHT:
39. GameView.block.moveRight();
40. break;
43. default:
44. GameView.block.downLoad();
45. break;
46. }
48. }
49. };
54. //创建线程
55. new Thread (new Runnable(){
57. @Override
58. public void run() {
59. while(true){
60. try{
61. System.out.println("子线程名称：：："+Thread.currentThread().getName());
62. //block.downLoad();
63. Thread.sleep(1000);
64. handler.sendEmptyMessage(dir);
65. }catch(Exception e){
66. e.printStackTrace();
67. }
68. }
70. }
72. }).start();
73. }
75. @Override
76. protected void onDraw(Canvas canvas) {
78. super.onDraw(canvas);
79. //设置了画布的颜色
80. canvas.drawARGB(255, 0,0, 255);
81. //设置一个画笔
82. Paint paint=new Paint();
83. paint.setARGB(255,255, 0,0);
84. canvas.drawCircle(block.getX(), block.getY(), 10, paint);
85. }
87. }

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(){@Overridepublic 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();}@Overrideprotected 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 plaincopyprint?

1. package com.example.tetris;
5. import android.app.Activity;
6. import android.os.Bundle;
7. import android.os.Handler;
8. import android.os.Message;
9. import android.view.Menu;
10. import android.view.View;
11. import android.widget.Button;
12. import android.widget.Toast;
13. import www.csdn.net.tetris.domain.Block;
14. import www.csdn.net.tetris.view.GameView;
17. public class GameActivityextends Activity {
18. //声明按钮控件
19. public Button btn_start;
20. public Button btn_right;
21. public Button btn_left;
25. @Override
26. protected void onCreate(Bundle savedInstanceState) {
27. super.onCreate(savedInstanceState);
28. setContentView(R.layout.activity_game);
29. //获取按钮控件
30. btn_start=(Button) findViewById(R.id.btn_start);
33. btn_start.setOnClickListener(new MyOnClickListener());
34. System.out.println("主线程：：："+Thread.currentThread().getName());
37. }
39. @Override
40. public boolean onCreateOptionsMenu(Menu menu) {
41. // Inflate the menu; this adds items to the action bar if it is present.
42. getMenuInflater().inflate(R.menu.main, menu);
43. return true;
44. }
46. class MyOnClickListener implements View.OnClickListener{
48. @Override
49. public void onClick(View v) {
50. int id=v.getId();
51. switch (id) {
52. case R.id.btn_start:
53. //GameView gameView=new GameView(GameActivity.this,null);
54. GameActivity.this.setContentView(R.layout.activity_layout);
56. //获取控件
57. btn_right=(Button) findViewById(R.id.btn_right);
58. btn_left=(Button) findViewById(R.id.btn_left);
60. btn_left.setOnClickListener(new MyOnClickListener());
61. btn_right.setOnClickListener(new MyOnClickListener());
64. break;
65. case R.id.btn_left:
66. Toast.makeText(GameActivity.this,"向左移动", Toast.LENGTH_LONG).show();
67. GameView.block.moveLeft();
68. //GameView.dir=GameView.DIRLEFT;
69. break;
70. case R.id.btn_right:
71. Toast.makeText(GameActivity.this,"向右移动", Toast.LENGTH_LONG).show();
72. GameView.block.moveRight();
73. //GameView.dir=GameView.DIRRIGHT;
74. break;
76. default:
77. break;
78. }
80. }
82. }
83. }