Android 开发（五）主界面

一、从登陆界面进入之后，将进入主页面。

二、主页面是各个功能的列表，可以选择不同的功能进入。最上面是用户头像，点击可以进入用户设置。

activity_main.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     tools:context=".MainActivity" >
 7 
 8     <ImageButton 
 9         android:id="@+id/ImageButton"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:background="#00000000"
13         android:src="@drawable/header"
14         android:maxWidth="30dp"
15         android:maxHeight="30dp"
16         android:layout_gravity="center_horizontal"/>
17     <Button 
18         android:id="@+id/SmileButton"
19         android:layout_width="match_parent"
20         android:layout_height="wrap_content"
21         android:text="@string/smile"/>
22     <Button 
23         android:id="@+id/ThinkButton"
24         android:layout_width="match_parent"
25         android:layout_height="wrap_content"
26         android:text="@string/think"/>
27     <Button 
28         android:id="@+id/DiscussButton"
29         android:layout_width="match_parent"
30         android:layout_height="wrap_content"
31         android:text="@string/discuss"/>
32     <Button 
33         android:id="@+id/MusicButton"
34         android:layout_width="match_parent"
35         android:layout_height="wrap_content"
36         android:text="@string/music"/>
37     <Button 
38         android:id="@+id/NoteButton"
39         android:layout_width="match_parent"
40         android:layout_height="wrap_content"
41         android:text="@string/note"/>
42     <Button 
43         android:id="@+id/FriendButton"
44         android:layout_width="match_parent"
45         android:layout_height="wrap_content"
46         android:text="@string/friend"/>
47 
48 </LinearLayout>
49 

三、MainActivity.java

  1 package com.diandianmi.activity;
  2 
  3 import com.diandianmi.service.DataBaseService;
  4 
  5 import android.os.Bundle;
  6 import android.app.Activity;
  7 import android.content.Intent;
  8 import android.graphics.Bitmap;
  9 import android.view.Menu;
 10 import android.view.View;
 11 import android.view.View.OnClickListener;
 12 import android.widget.Button;
 13 import android.widget.ImageButton;
 14 import android.widget.ImageView;
 15 
 16 public class MainActivity extends Activity {
 17 
 18     private ImageButton imgShow;
 19     
 20     String username = null;
 21     @Override
 22     protected void onCreate(Bundle savedInstanceState) {
 23         super.onCreate(savedInstanceState);
 24         setContentView(R.layout.activity_main);
 25         imgShow = (ImageButton) this.findViewById(R.id.ImageButton);
 26         imgShow.setAdjustViewBounds(true);  //调整图片的大小
 27         username = getIntent().getStringExtra("username");
 28         if(username!=null){
 29             DataBaseService dbSer = new DataBaseService(this);
 30             Bitmap bit = dbSer.getIconByName(username);
 31             if(bit!=null){
 32                 imgShow.setImageBitmap(bit);
 33             }
 34         }
 35         
 36         Button smileButton = (Button)findViewById(R.id.SmileButton);
 37         Button thinkButton = (Button)findViewById(R.id.ThinkButton);
 38         Button discussButton = (Button)findViewById(R.id.DiscussButton);
 39         Button musicButton = (Button)findViewById(R.id.MusicButton);
 40         Button noteButton = (Button)findViewById(R.id.NoteButton);
 41         Button friendButton = (Button)findViewById(R.id.FriendButton);
 42         
 43         
 44         
 45         OnClickListener clickListener = new OnClickListener(){
 46             Intent intent ;
 47             
 48             @Override
 49             public void onClick(View view) {
 50                 switch(view.getId()){
 51                 case R.id.SmileButton:
 52                     intent = new Intent(MainActivity.this,SmileActivity.class);
 53                     startActivity(intent);
 54                     break;
 55                 case R.id.ThinkButton:
 56                     intent = new Intent(MainActivity.this,ThinkActivity.class);
 57                     startActivity(intent);
 58                     break;
 59                 case R.id.DiscussButton:
 60                     intent = new Intent(MainActivity.this,DiscussActivity.class);
 61                     startActivity(intent);
 62                     break;
 63                 case R.id.MusicButton:
 64                     intent = new Intent(MainActivity.this,MusicActivity.class);
 65                     startActivity(intent);
 66                     break;
 67                 case R.id.NoteButton:
 68                     intent = new Intent(MainActivity.this,NoteActivity.class);
 69                     startActivity(intent);
 70                     break;
 71                 case R.id.FriendButton:
 72                     intent = new Intent(MainActivity.this,FriendActivity.class);
 73                     startActivity(intent);
 74                     break;
 75                 case R.id.ImageButton:
 76                     intent = new Intent(MainActivity.this,UserActivity.class);
 77                     startActivity(intent);
 78                     break;
 79                 }
 80             }
 81             
 82         };
 83         
 84         smileButton.setOnClickListener(clickListener);
 85         thinkButton.setOnClickListener(clickListener);
 86         discussButton.setOnClickListener(clickListener);
 87         musicButton.setOnClickListener(clickListener);
 88         noteButton.setOnClickListener(clickListener);
 89         friendButton.setOnClickListener(clickListener);
 90         imgShow.setOnClickListener(clickListener);
 91         
 92     }
 93 
 94     
 95     
 96     @Override
 97     public boolean onCreateOptionsMenu(Menu menu) {
 98         // Inflate the menu; this adds items to the action bar if it is present.
 99         getMenuInflater().inflate(R.menu.main, menu);
100         return true;
101     }
102 
103 }
104