編輯:關於Android編程
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="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); } }
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
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; //這裡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); } } }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持本站。
轉載請注明出處 http://blog.csdn.net/typename/ powered by miechal zhao : miechalzhao@gmail.
在使用studio開發的項目過程中有時候我們想將項目發布到github上,以前都是用一種比較麻煩的方式(cmd)進行提交,最近發現studio其實是自帶這種功能的,終於可
需求:自定義一個ViewGroup,實現可以下拉刷新的功能。下拉一定距離後(下拉時顯示的界面可以自定義任何復雜的界面)釋放手指可以回調刷新的功能,用戶處理完刷新的內容後,
這是我在使用Android Studio過程中接觸到的一些快捷鍵,和大家分享,後面會繼續完善此文,也歡迎大家踴躍補充,一起完善。快捷鍵刪除並剪貼行:Ctrl+X復制一行: