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" > <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>
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; @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); } }
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; @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); } /** * *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> { @Override protected 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; } @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); } } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
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