怎么实现运行时控件添加，拖拉，定位？

Question

我之前做的是条码，可以手动拖动，也可以用手势缩放，其实就是一个imageview，设置一下就可以实现了

Answer 1

这个例子是按钮会跟着手移动，你先按我的调试出来看看效果就知道了。
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RelativeLayout;
public class TestHand extends Activity implements View.OnTouchListener {
    private Button btnTest;
    private ViewGroup root;
    private int x;
    private int y;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_hand);
        root=(ViewGroup)findViewById(R.id.root);
        btnTest=(Button)findViewById(R.id.btnTest);
        RelativeLayout.LayoutParams layoutParams=new RelativeLayout.LayoutParams(150,50);
        layoutParams.leftMargin=50;
        layoutParams.topMargin=50;
        layoutParams.bottomMargin=50;
        layoutParams.rightMargin=-250;
        btnTest.setLayoutParams(layoutParams);
        btnTest.setOnTouchListener(this);
    }    @Override
    public boolean onTouch(View v, MotionEvent event) {
        final int X=(int)event.getRawX();
        final int Y=(int)event.getRawY();
        switch (event.getAction() & MotionEvent.ACTION_MASK){
            case MotionEvent.ACTION_DOWN:
                RelativeLayout.LayoutParams lParams=(RelativeLayout.LayoutParams)v.getLayoutParams();
                this.x=X-lParams.leftMargin;
                this.y=Y-lParams.topMargin;
                break;
            case MotionEvent.ACTION_MOVE:
                RelativeLayout.LayoutParams layoutParams=(RelativeLayout.LayoutParams)v.getLayoutParams();
                layoutParams.leftMargin=X-this.x;
                layoutParams.topMargin=Y-this.y;
                layoutParams.rightMargin=-250;
                layoutParams.bottomMargin=-250;
                v.setLayoutParams(layoutParams);
                break;
        }
        root.invalidate();
        return true;
    }
}XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试"
        android:id="@+id/btnTest" /></RelativeLayout>