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    很多应用为了节省空间而又使界面能够充足的显示信息，大多数应用都采用了侧边栏的方式，如下图：
    
                     
    
    来说说它的思路，底下是两个或多个视图，分别通过控制它们的宽度、左边距来控制它们的显示，来看看代码
    activity_main.xml
   

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/layout"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="horizontal"tools:context=".MainActivity" ><LinearLayoutandroid:id="@+id/menu"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/menu" ></LinearLayout><LinearLayoutandroid:id="@+id/content"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/content" ></LinearLayout></LinearLayout>

    
    
    
    MainActivity.java
   

public class MainActivity extends Activity implements OnTouchListener
{private LinearLayout menu;private LinearLayout content;private LayoutParams menuParams;private LayoutParams contentParams;// menu完全显示时，留给content的宽度值。private static final int menuPadding = 80;// 分辨率private int disPlayWidth;private float xDown;private float xMove;private boolean mIsShow = false;private static final int speed = 50;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);disPlayWidth = getWindowManager().getDefaultDisplay().getWidth();menu = (LinearLayout) findViewById(R.id.menu);content = (LinearLayout) findViewById(R.id.content);menuParams = (LayoutParams) menu.getLayoutParams();contentParams = (LayoutParams) content.getLayoutParams();findViewById(R.id.layout).setOnTouchListener(this);menuParams.width = disPlayWidth - menuPadding;contentParams.width = disPlayWidth;showMenu(mIsShow);}@Overridepublic boolean onTouch(View v, MotionEvent event){switch (event.getAction()){case MotionEvent.ACTION_DOWN:showMenu(!mIsShow);break;case MotionEvent.ACTION_MOVE:break;case MotionEvent.ACTION_UP:break;}return true;}private void showMenu(boolean isShow){if (isShow){mIsShow = true;menuParams.leftMargin = 0;} else{mIsShow = false;menuParams.leftMargin = 0 - menuParams.width;}menu.setLayoutParams(menuParams);}}

    
    上述代码只是用两张图片代替了两个复杂的view(layout)，你会发现，两个视图虽然可以切换，但没有动画的感觉，再加上要有拖动效果，所以，我们再给它加个平移时间段，看起来有动画的效果
    
   

package com.example.test;import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;public class MainActivity extends Activity implements OnTouchListener, OnClickListener
{private LinearLayout menu;private LinearLayout content;private LayoutParams menuParams;private LayoutParams contentParams;// menu完全显示时，留给content的宽度值。private static final int menuPadding = 80;// 分辨率private int disPlayWidth;private float xDown;private float xMove;private boolean mIsShow = false;private static final int speed = 50;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);disPlayWidth = getWindowManager().getDefaultDisplay().getWidth();menu = (LinearLayout) findViewById(R.id.menu);menu.setOnClickListener(this);content = (LinearLayout) findViewById(R.id.content);content.setOnClickListener(this);menuParams = (LayoutParams) menu.getLayoutParams();contentParams = (LayoutParams) content.getLayoutParams();//findViewById(R.id.layout).setOnTouchListener(this);menuParams.width = disPlayWidth - menuPadding;contentParams.width = disPlayWidth;showMenu(mIsShow);}@Overridepublic void onClick(View v){switch (v.getId()){case R.id.menu:new showMenuAsyncTask().execute(-50);break;case R.id.content:new showMenuAsyncTask().execute(50);break;}}@Overridepublic boolean onTouch(View v, MotionEvent event){switch (event.getAction()){case MotionEvent.ACTION_DOWN:showMenu(!mIsShow);break;case MotionEvent.ACTION_MOVE:break;case MotionEvent.ACTION_UP:break;}return true;}private void showMenu(boolean isShow){if (isShow){mIsShow = true;menuParams.leftMargin = 0;} else{mIsShow = false;menuParams.leftMargin = 0 - menuParams.width;}menu.setLayoutParams(menuParams);}/****这是主要代码：模拟动画过程，也让我更熟悉了AsyncTask这玩意儿**/class showMenuAsyncTask extends AsyncTask<Integer, Integer, Integer>{@Overrideprotected Integer doInBackground(Integer... params){int leftMargin = menuParams.leftMargin;//这里也是值得学习的地方，如果在平常，自己肯定又是这样写://   if(){//       while()//  }//   else if(){//       while()//  }while (true){leftMargin += params[0];if (params[0] > 0 && leftMargin >= 0){break;} else if (params[0] < 0 && leftMargin <= -menuParams.width){break;}publishProgress(leftMargin);try{Thread.sleep(30);} catch (InterruptedException e){e.printStackTrace();}}return leftMargin;}@Overrideprotected void onProgressUpdate(Integer... values){super.onProgressUpdate(values);menuParams.leftMargin = values[0];menu.setLayoutParams(menuParams);}@Overrideprotected void onPostExecute(Integer result){super.onPostExecute(result);menuParams.leftMargin = result;menu.setLayoutParams(menuParams);}}}

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