android 仿人人網滑動側邊欄
很多應用為了節省空間而又使界面能夠充足的顯示信息，大多數應用都采用了側邊欄的方式，如下圖：
來說說它的思路，底下是兩個或多個視圖，分別通過控制它們的寬度、左邊距來控制它們的顯示，來看看代碼
activity_main.xml
<LinearLayout xmlns:android="<LinearLayout android:id="@+id/menu" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/menu" > </LinearLayout> <LinearLayout android:id="@+id/content" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/content" > </LinearLayout></LinearLayout></pre> MainActivity.java
public class MainActivity extends Activity implements OnTouchListener {private LinearLayout menu; private LinearLayout content; private LayoutParams menuParams; private LayoutParams contentParams; // menu完全顯示時，留給content的寬度值。 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; @Override protected 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); } @Override public 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); } }</pre> 上述代碼只是用兩張圖片代替了兩個復雜的view(layout)，你會發現，兩個視圖雖然可以切換，但沒有動畫的感覺，再加上要有拖動效果，所以，我們再給它加個平移時間段，看起來有動畫的效果 <br />
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完全顯示時，留給content的寬度值。 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; @Override protected 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); } @Override public 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; } } @Override public 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); } /** * *這是主要代碼：模擬動畫過程，也讓我更熟悉了AsyncTask這玩意兒 * */ class showMenuAsyncTask extends AsyncTask<Integer, Integer, Integer> { @Override protected Integer doInBackground(Integer... params) { int leftMargin = menuParams.leftMargin; //這里也是值得學習的地方，如果在平常，自己肯定又是這樣寫: // 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; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); menuParams.leftMargin = values[0]; menu.setLayoutParams(menuParams); } @Override protected void onPostExecute(Integer result) { super.onPostExecute(result); menuParams.leftMargin = result; menu.setLayoutParams(menuParams); } }}</pre>
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