android开发分享android-intent

1. mainActivity

package com.example.expintent;  import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button;  public class MainActivity extends Activity {  	private Button btn_open; 	@Override 	protected void onCreate(Bundle savedInstanceState) { 				 		super.onCreate(savedInstanceState); 		setContentView(R.layout.activity_main); 		btn_open=(Button)findViewById(R.id.btn_open); 		btn_open.setOnClickListener(new OnClickListener() { 			 			public void onClick(View v) { 				// TODO Auto-generated method stub 				Intent intent=new Intent(); 				intent.setClass(MainActivity.this,newActivity.class); 				startActivity(intent); 			} 		}); 	}    } 

<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"     xmlns:tools="https://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context=".MainActivity" >      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/hello_world" />     <Button         android:id="@+id/btn_open"         android:layout_width="match_parent"         android:layout_height="50dp"            android:text="@string/btn" />  </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android"     package="com.example.expintent"     android:versionCode="1"     android:versionName="1.0" >      <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="18" />      <application         android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity             android:name="com.example.expintent.MainActivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                  <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>         		<activity android:name="newActivity">            	 	</activity>     </application>  </manifest> 

2.newActivity

package com.example.expintent;  import android.app.Activity; import android.os.Bundle;  public class newActivity extends Activity { 	 	@Override 	protected void onCreate(Bundle savedInstanceState) { 		// TODO Auto-generated method stub 		super.onCreate(savedInstanceState); 		setContentView(R.layout.newactivity); 	}  }