Android game development View framework

Press the upper/lower key rectangle on the keyboard to move up and down;

The Handler object is instantiated and the handkeMessage method is rewritten to implement a message receiver. Then, the thread sends the update interface message through the sendMessage method. When the receiver receives the update interface message, it executes the invalidate method to update the screen display.

Package com. yarin. android. testOnView; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. view. view; public class GameView extends View {int miCount = 0; int y = 0; public GameView (Context context) {super (context);} public void onDraw (Canvas canvas) {if (miCount <100) {miCount ++;} else {miCount = 0 ;}// drawing Paint mPaint = new Paint (); switch (miCount % 4) {case 0: mPaint. setColor (Color. BLUE); break; case 1: mPaint. setColor (Color. GREEN); break; case 2: mPaint. setColor (Color. RED); break; case 3: mPaint. setColor (Color. YELLOW); break; default: mPaint. setColor (Color. WHITE); break;} // draw a rectangular canvas. drawRect (320-80)/2, y, (320-80)/2 + 80, y + 40, mPaint) ;}} package com. yarin. android. testOnView; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. view. view; public class GameView extends View {int miCount = 0; int y = 0; public GameView (Context context) {super (context);} public void onDraw (Canvas canvas) {if (miCount <100) {miCount ++;} else {miCount = 0 ;}// drawing Paint mPaint = new Paint (); switch (miCount % 4) {case 0: mPaint. setColor (Color. BLUE); break; case 1: mPaint. setColor (Color. GREEN); break; case 2: mPaint. setColor (Color. RED); break; case 3: mPaint. setColor (Color. YELLOW); break; default: mPaint. setColor (Color. WHITE); break;} // draw a rectangular canvas. drawRect (320-80)/2, y, (320-80)/2 + 80, y + 40, mPaint );}

} The above is used to draw the interface. We also need a class to control the operation of the application.

 

Package com. yarin. android. testOnView; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. view. keyEvent; import android. view. motionEvent; public class ControlView extends Activity {private static final int REFRESH = 0x000001; private GameView mGameView = null; @ Override public void onCreate (Bundle savedInstanceState) {super. o NCreate (savedInstanceState); this. mGameView = new GameView (this); // set to display as our custom View (GameView) setContentView (mGameView); // enable the Thread new Thread (new GameThread ()). start ();} Handler myHandler = new Handler () {// public void handleMessage (Message msg) {switch (msg. what) {case ControlView. REFRESH: mGameView. invalidate (); break;} super. handleMessage (msg) ;}}; class GameThread implements Runn Able {public void run () {while (! Thread. currentThread (). isInterrupted () {Message message = new Message (); message. what = ControlView. REFRESH; // send the message Activity01.this. myHandler. sendMessage (message); try {Thread. sleep (100);} catch (InterruptedException e) {Thread. currentThread (). interrupt () ;}}}// of course, these events can also be written in GameView. // The trigger event public boolean onTouchEvent (MotionEvent event) {return true ;} // press the key to event public boolean onKeyDown (int KeyCode, KeyEvent event) {return true;} // press the key to bring up the public boolean onKeyUp (int keyCode, KeyEvent event) {switch (keyCode) {// The case KeyEvent key on the right. KEYCODE_DPAD_UP: mGameView. y-= 3; break; // case KeyEvent. KEYCODE_DPAD_DOWN: mGameView. y + = 3; break;} return false;} public boolean onKeyMultiple (int keyCode, int repeatCount, KeyEvent) {return true ;}} package com. yarin. android. testOnView; im Port android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. view. keyEvent; import android. view. motionEvent; public class ControlView extends Activity {private static final int REFRESH = 0x000001; private GameView mGameView = null; @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); this. mGameView = New GameView (this); // set to display as our custom View (GameView) setContentView (mGameView); // enable the Thread new Thread (new GameThread ()). start ();} Handler myHandler = new Handler () {// public void handleMessage (Message msg) {switch (msg. what) {case ControlView. REFRESH: mGameView. invalidate (); break;} super. handleMessage (msg) ;}}; class GameThread implements Runnable {public void run () {while (! Thread. currentThread (). isInterrupted () {Message message = new Message (); message. what = ControlView. REFRESH; // send the message Activity01.this. myHandler. sendMessage (message); try {Thread. sleep (100);} catch (InterruptedException e) {Thread. currentThread (). interrupt () ;}}}// of course, these events can also be written in GameView. // The trigger event public boolean onTouchEvent (MotionEvent event) {return true ;} // press the key to press the event public boolean onKeyDown (int keyCode, KeyEvent event) {return true;} // press the key to bring up the event public boolean onKeyUp (int keyCode, KeyEvent event) {switch (keyCode) {// case KeyEvent. KEYCODE_DPAD_UP: mGameView. y-= 3; break; // case KeyEvent. KEYCODE_DPAD_DOWN: mGameView. y + = 3; break;} return false;} public boolean onKeyMultiple (int keyCode, int repeatCount, KeyEvent event) {return true ;}}