Android基于widget组件实现物体移动/控件拖动功能示例

package com.sky;import android.app.Activity;import android.os.Bundle;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.AbsoluteLayout;import android.widget.Button;@SuppressWarnings("deprecation")public class AbosoluteMove extends Activity implements OnClickListener{ /** Called when the activity is first created. */ public Button button1; public Button button2; public Button button3; public Button button4; Button tmp;//临时保存，选择的BUTTON int x; int y; int flag;//用于标志选择哪个BUTTON  @Override  public void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    button1=(Button) findViewById(R.id.widget27);    button2=(Button) findViewById(R.id.widget28);    button3=(Button) findViewById(R.id.widget29);    button4=(Button) findViewById(R.id.widget30);    button1.setOnClickListener(this);    button2.setOnClickListener(this);    button3.setOnClickListener(this);    button4.setOnClickListener(this);  } @Override public void onClick(View v) { // TODO Auto-generated method stub switch(v.getId()) {  case R.id.widget27:  flag=R.id.widget27;  setTitle("button1");  break;  case R.id.widget28:  flag=R.id.widget28;  setTitle("button2");  break;  case R.id.widget29:  flag=R.id.widget29;  setTitle("button3");  break;  case R.id.widget30:  flag=R.id.widget30;  setTitle("button4");  break; } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub return super.onKeyDown(keyCode, event); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub x = (int) event.getX();    y = (int) event.getY();    tmp=(Button) findViewById(flag);//获取所选中的BUTTON    AbsoluteLayout.LayoutParams params1=new AbsoluteLayout.LayoutParams(50,50,x-25,y-50);    tmp.setLayoutParams(params1);//设置BUTTON的新位置    switch(event.getAction())    {      case MotionEvent.ACTION_DOWN:       tmp.invalidate();       tmp.setText("选中down");        break;      case MotionEvent.ACTION_UP:       tmp.invalidate();       tmp.setText("选中UP");        break;      case MotionEvent.ACTION_MOVE:       tmp.invalidate();       tmp.setText("选中move");        break;    }    return super.onTouchEvent(event); }}