widget物体移动/控件拖动
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BUTTONint 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); }@Overridepublic void onClick(View v){// TODO Auto-generated method stubswitch(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;}}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event){// TODO Auto-generated method stubreturn super.onKeyDown(keyCode, event);}@Overridepublic boolean onTouchEvent(MotionEvent event){// TODO Auto-generated method stubx = (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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