Android中Widget的使用示例

Android中Widget的使用示例

之前已经写过通过重绘整个背景的方式，实现物体移动。今天要讲的是，
如何通过移动widget,view等控件，实现部分重绘。结合之前发Droiddraw工具，使用AbsoluteLayout,可以随意放置控件在任何位置。
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);
}
}

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