android多点触屏

package irdc.ex07_02; /* import相关class */ import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.graphics.Shader; import android.os.Bundle; import android.util.Log; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; public class multi extends Activity { public float x1, x2, y1, y2; private MyView myView; @Override public void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); // getWindow().setFlags(flags, mask) x1 = 30; y1 = 30; x2 = 200; y2 = 30; super.onCreate(savedInstanceState); /* 设置ContentView为自定义的MyView */ myView = new MyView(this); setContentView(myView); } @Override public boolean onTouchEvent(MotionEvent event) { // if(event.getX(1)==event.getX(0)&&event.getY(1)==event.getY(0)) if (event.getPointerCount() == 2) { x2 = event.getX(1); y2 = event.getY(1); } x1 = event.getX(0); y1 = event.getY(0); myView.invalidate(); Log.d("multi01", event.getPointerCount() + " xy1: " + x1 + ", " + y1 + " xy2: " + x2 + ", " + y2); return super.onTouchEvent(event); } /* 自定义继承View的MyView */ private class MyView extends View { public MyView(Context context) { super(context); } /* 覆盖onDraw() */ @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /* 设置背景为白色 */ canvas.drawColor(Color.WHITE); Paint paint = new Paint(); /* 去锯齿 */ paint.setAntiAlias(true); /* 设置paint的style为FILL：实心 */ paint.setStyle(Paint.Style.FILL); /* 设置paint的颜色 */ paint.setColor(Color.BLUE); /* 画一个实心圆 */ canvas.drawCircle(x1, y1, 30, paint); /* 画一个实心正方形 */ canvas.drawRect(x2 - 30, y2 - 30, x2 + 30, y2 + 30, paint); paint.setColor(Color.RED); canvas.drawLine(x1, y1, x2, y2, paint); /* 设置渐变色 */ Shader mShader = new LinearGradient(0, 0, 100, 100, new int[] { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }, null, Shader.TileMode.REPEAT); paint.setShader(mShader); /* 写字 */ paint.setTextSize(14); canvas.drawText("xy1: " + x1 + "; " + y1, 80, 50, paint); canvas.drawText("xy2: " + x2 + "; " + y2, 80, 120, paint); } } }