Simple use of SurfaceView in Android game development

Simple use of SurfaceView in Android game development
Related Knowledge points: 1. Call back a SurfaceView to implement a SurfaceHolder. Callback interface. To notify the View when the underlying Surface status changes, this interface needs to implement the following three methods: public void surfaceCreated (SurfaceHolder holder) {} public void surfaceChanged (SurfaceHolder holder, int format, int width, int height) {} public void surfaceDestroyed (SurfaceHolder holder) {} 2. SurfaceHolder this is an interface used to control the surface, which provides a control over the surface size, the getHolder () function of SurfaceView can obtain the SurfaceHolder object, and the Surface is in the SurfaceHolder object. 3. Specific Code: MySurfaceView. java

package cn.llbb.testsurfaceviewdemo;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.Rect;import android.graphics.RectF;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback {private SurfaceHolder sfh;private Canvas canvas;private Paint paint;public MySurfaceView(Context context) {super(context);sfh = getHolder();sfh.addCallback(this);paint = new Paint();paint.setColor(Color.RED);setFocusable(true);}public void surfaceCreated(SurfaceHolder holder) {MyDraw();}public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}public void surfaceDestroyed(SurfaceHolder holder) {}private void MyDraw(){try{canvas = sfh.lockCanvas();if(canvas != null){canvas.drawColor(Color.WHITE);canvas.drawText("drawtext", 10, 10, paint);canvas.drawPoint(10, 20, paint);canvas.drawPoints(new float[]{10,30,30,30}, paint);canvas.drawLine(10,40,50,40, paint);canvas.drawLines(new float[]{10,50,50,50,70,50,110,50}, paint);canvas.drawRect(10,60,40,100, paint);Rect rect = new Rect(10,110,60,130);canvas.drawRect(rect, paint);RectF rectf = new RectF(10,140,60,170);canvas.drawRoundRect(rectf, 20, 20, paint);canvas.drawCircle(20, 200, 20, paint);canvas.drawArc(new RectF(150,20,200,70), 0, 230, true, paint);canvas.drawOval(new RectF(150,80,180,100), paint);Path path = new Path();path.moveTo(160,150);path.lineTo(200,150);path.lineTo(180,200);path.close();canvas.drawPath(path, paint);Path pathcircle = new Path();pathcircle.addCircle(130, 260, 20, Path.Direction.CCW);canvas.drawTextOnPath("pathtext", pathcircle, 10, 20, paint);}}catch(Exception e){}finally{sfh.unlockCanvasAndPost(canvas);}}}MainActivity.javapackage cn.llbb.testcanvasdemo;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.Window;import android.view.WindowManager;public class MainActivity extends Activity {protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);//getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(new MySurfaceView(this));}}