Android-->View.setX()和.setY()的使用(移动布局,设置布局位置,动态添加View)

示例图:

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重点在于 从写 了 TouchView,原理是一样的:

public class TouchView extends ImageView {

    public TouchView(Context context) {
        super(context);

        this.setImageResource(R.drawable.ic_launcher);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(100, 100);
    }

    float downX, downY;
    float moveX, moveY;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            downX = event.getRawX();
            downY = event.getRawY();
        }

        if (event.getAction() == MotionEvent.ACTION_MOVE) {
            moveX = event.getRawX();
            moveY = event.getRawY();

            this.setX(getX() + (moveX - downX));
            this.setY(getY() + (moveY - downY));
            downX = moveX;
            downY = moveY;
        }

        return true;// 返回true 表示 处理Touch事件
        // return super.onTouchEvent(event);
    }

}

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public class MainActivity extends Activity {


    LinearLayout linear;
    RelativeLayout relative;
    FrameLayout frame;
    AbsoluteLayout absolute;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        linear = (LinearLayout) findViewById(R.id.linear);
        relative = (RelativeLayout) findViewById(R.id.relative);
        frame = (FrameLayout) findViewById(R.id.frame);
        absolute = (AbsoluteLayout) findViewById(R.id.absolute);

        linear.addView(new TouchView(this));
        relative.addView(new TouchView(this));
        frame.addView(new TouchView(this));
        absolute.addView(new TouchView(this));
    }
}

源代码下载地址:http://download.youkuaiyun.com/detail/angcyo/8953263

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