Android Development in the multi-threading implementation of the use of custom control to draw the ball and complete the ball automatic drop function Example _android

This article describes the Android development of the multi-threading implementation of the use of custom control to draw a small ball and complete the ball automatic drop function method. Share to everyone for your reference, specific as follows:

1. Layout interface

<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=" Wra P_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:layou T_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, the package of a drawn diagram of the class

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
 }
 Move the public
 void MoveLeft () {x-=10 to the left
  ;
  Gameview.invalidate ();
 }
 Move the public
 void MoveRight () {x+=10 to the right
  ;
  Gameview.invalidate ();
 }
 Drop method public
  void DownLoad () {
   y+=10;
   Gameview.invalidate ()//Redraw
  } 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. Create a canvas and thread operation

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 The extends View {public static blocks block;
 Public Handler Handler;
 Defines the direction public static int dir=-1;
 Up and down about 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);
  Create Tetris Object 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
}
   }
  };  Create thread new Runnable () {@Override public void run () {while (true) {try{System.out.pri
      NTLN ("Child Thread Name:::" +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);
  Set the color of the canvas Canvas.drawargb (255, 0, 0, 255);
  Set a brush Paint paint=new Paint ();
  Paint.setargb (255, 255, 0, 0);
 Canvas.drawcircle (Block.getx (), block.gety (), paint);

 }
}

4, actions in mainactivity

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 the activity {//Declare button control public buttons Btn_start; public pushbutton btn_right; public button Btn_
Left @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (
R.layout.activity_game);
Gets the button btn_start= Findviewbyid (R.id.btn_start);
Btn_start.setonclicklistener (New Myonclicklistener ());
System.out.println ("Main thread:::" +thread.currentthread (). GetName ()); @Override public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu, this adds the items to the action bar if it I
s 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://g
Ameview gameview=new Gameview (gameactivity.this,null);
GameActivity.this.setContentView (r.layout.activity_layout);
Gets the control 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, "Move Left", Toast.length_long). Show ();
GameView.block.moveLeft ();
Gameview.dir=gameview.dirleft;
Break
Case R.id.btn_right:toast.maketext (gameactivity.this, "Move Right", Toast.length_long). Show ();
GameView.block.moveRight ();
Gameview.dir=gameview.dirright;
Break
Default:break;

 }
}
}
}

I hope this article will help you with your Android programming.