本篇文章主要介绍了"Android中view的简单应用---随手指移动的小球"，主要涉及到Canvas,Activity方面的内容，对于移动开发感兴趣的同学可以参考一下：
public class DrawView extends View{
public float currentX=40;
public fl...
public class DrawView extends View{
public float currentX=40;
public float currentY=50;
public DrawView(Context context){
super(context);
}
//重写ondraw,通过Canvas绘画
protected void onDraw(Canvas Canvas){
Paint paint=new Paint();
paint.setColor(Color.RED);
Canvas.drawCircle(currentX,currentY,25,paint);
}
public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.Activity_main);
LinearLayout root=(LinearLayout) findViewById(R.id.root);
final DrawView drawView=new DrawView(this);
WindowManager wm = this.getWindowManager();
int width = wm.getDefaultDisplay().getWidth();
int height = wm.getDefaultDisplay().getHeight();
Toast.makeText(this,"width is"+width+"height"+height,Toast.LENGTH_LONG).show();
drawView.setMinimumHeight(300);
drawView.setMinimumHeight(500);
drawView.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
drawView.currentX=event.getX();
drawView.currentY=event.getY();
drawView.invalidate();
return true;
}
});
root.addView(drawView);
}
}
以上就介绍了Android中view的简单应用---随手指移动的小球，包括了Canvas,Activity方面的内容，希望对移动开发有兴趣的朋友有所帮助。
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