Activity生命周期(一)

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7     <TextView
 8         android:id="@+id/firstMultiActivity"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content"
11         android:text="Hello Mirror"
12         /> 
13 
14 </LinearLayout>

 1 package first.pack;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 
 6 public class MultiActivity extends Activity{
 7 
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         // TODO Auto-generated method stub
11         super.onCreate(savedInstanceState);
12         setContentView(R.layout.multi_main);  //加载
13     }
14     
15 }

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="first.pack"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="first.pack.MainActivity"  //Activity的名字：包名+类名
            android:label="@string/app_name" >  //程序运行界面的Label名称
            <intent-filter>  //这一段放在哪就使该Activity成为默认Activity
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="first.pack"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="8"
 9         android:targetSdkVersion="19" />
10 
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="first.pack.MainActivity"
18             android:label="@string/FirstMirror" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21 
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25         
26         <activity
27             android:name="first.pack.MultiActivity"  //包名+类名
28             android:label="@string/SecondMirror" >  //跟主Activity区别开来
29         </activity>
30         
31     </application>
32 
33 </manifest>

 1 public static class PlaceholderFragment extends Fragment {
 2         
 3         private Button button;
 4 
 5         public PlaceholderFragment() {
 6         }
 7 
 8         @Override
 9         public View onCreateView(LayoutInflater inflater, ViewGroup container,
10                 Bundle savedInstanceState) {
11             View rootView = inflater.inflate(R.layout.fragment_main, container, false);
12             
13             button = (Button)rootView.findViewById(R.id.firstButton);
14             
15             ButtonListener buttonListener = new ButtonListener();
16             button.setOnClickListener(buttonListener);
17             
18             return rootView;
19         }
20         
21         class ButtonListener implements OnClickListener{
22 
23             @Override
24             public void onClick(View v) {
25                 // TODO Auto-generated method stub
26                 Intent intent = new Intent();
27                 //第一个参数是context参数,activity类是Context类的子类，Activity都可向上转型为context
28                 //第二个参数是要启动的activity
29                 intent.setClass(getActivity(),MultiActivity.class); //重要！！！！
30                 startActivity(intent);
31             }            
32         }
33     }