2011.06.03——— android 1.6 launcher研究之SlidingDrawer

2011.06.03——— android 1.6 launcher研究之SlidingDrawer
参考：http://www.cnblogs.com/salam/archive/2010/10/19/1855511.html

lidingDrawer隐藏屏外的内容，并允许用户通过handle以显示隐藏内容。它可以垂直或水平滑动，它有俩个View组成，其一是可以拖动的handle,其二是隐藏内容的View.它里面的控件必须设置布局，在布局文件中必须指定handle和content.

MainActivity.java

package com.lp.drawer;import android.app.Activity;import android.graphics.drawable.TransitionDrawable;import android.os.Bundle;import android.widget.ImageButton;import android.widget.SlidingDrawer;import android.widget.SlidingDrawer.OnDrawerCloseListener;import android.widget.SlidingDrawer.OnDrawerOpenListener;import android.widget.SlidingDrawer.OnDrawerScrollListener;import android.widget.TextView;public class MainActivity extends Activity {        private SlidingDrawer slidingbar;    private ImageButton handler;    private TextView tv;    private TransitionDrawable td;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                slidingbar = (SlidingDrawer)findViewById(R.id.silidingbar);        handler = (ImageButton)findViewById(R.id.handler);        tv = (TextView)findViewById(R.id.tv);        td = (TransitionDrawable)handler.getDrawable();                DrawerManager dm = new DrawerManager();        slidingbar.setOnDrawerOpenListener(dm);        slidingbar.setOnDrawerCloseListener(dm);        slidingbar.setOnDrawerScrollListener(dm);            }        private class DrawerManager implements OnDrawerScrollListener,OnDrawerOpenListener,OnDrawerCloseListener{        public void onDrawerOpened() {            td.reverseTransition(150);        }                public void onDrawerClosed() {            td.reverseTransition(150);        }        public void onScrollStarted() {            tv.setText("开始滚动");        }        public void onScrollEnded() {            tv.setText("结束滚动");        }            }}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><SlidingDrawerandroid:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:id="@+id/silidingbar"android:handle="@+id/handler"android:content="@+id/content"><ImageButtonandroid:layout_width="128dip"android:layout_height="128dip"android:id="@id/handler"android:src="@drawable/handler"/><LinearLayoutandroid:layout_width="fill_parent"android:layout_height="fill_parent"android:id="@id/content"><TextViewandroid:layout_width="fill_parent"android:layout_height="fill_parent"android:gravity="center"android:textColor="#fe12ed"android:textStyle="bold"android:textSize="15px"android:id="@+id/tv"/></LinearLayout></SlidingDrawer></LinearLayout>

handler.xml

<?xml version="1.0" encoding="utf-8"?><transition xmlns:android="http://schemas.android.com/apk/res/android"><item android:drawable="@drawable/arrow_up" /><item android:drawable="@drawable/arrow_down" /></transition>

代码不难但是需要注意几点：
1、注意xml里面的SlidingDrawer 它里面的handler和content的id 都是"@+id/"，并不是"@id/"，都是新建的id 不是指向的id 而下面的ImageView,linerLayou的id都是指向的
2、layou:gravity 在父组件里面自己的对齐方式
gravity 如EditText 里面文字的对齐方式

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