(Android review)显示意图激活与隐式意图激活

一、基本知识点

1、<activity android:label="第一个activity" android:name=".Main2Activity"/>

label属性：某个Acivity的标题

    startActivity(intent);

二、举例

1、MainActivity

package com.example.multiactivity;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}
	
	
	public void open(View view){
		
		int id = view.getId();
	    if(id == R.id.open1){
	    	
	    	/**
	    	 * 以下演示了显示意图激活的5种方式
	    	 */
//	    	Intent intent = new Intent();
//	    	intent.setClass(this, MainActivity2.class);
//	    	intent.setClassName(this, "com.example.multiactivity.MainActivity2");
//	    	System.out.println("---------->" + getPackageName());
//	    	intent.setClassName(getPackageName(), "com.example.multiactivity.MainActivity2");//注意了第二个参数都是全类名
//	    	intent.setComponent(new ComponentName(this, MainActivity2.class));
	    	
	    	Intent intent = new Intent(this, MainActivity2.class);
	    	startActivity(intent);
	    }else if(id == R.id.open2){
	    	Intent intent = new Intent();
	    	intent.setAction("hellointent");
//	    	intent.setData(Uri.parse("zhangzetian:"));
//	    	intent.setType("image/jpeg");
	    	intent.setDataAndType(Uri.parse("zhangzetian:"), "image/jpeg");
	    	
	    	
	    	startActivity(intent);
	    }else if(id == R.id.open3){
	    	Intent intent = new Intent();
	    	intent.setAction(("android.intent.action.VIEW"));
	    	intent.setData(Uri.parse("http://www.baidu.com"));
	    	
	    	startActivity(intent);
	    }
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

2、MainActivity2

package com.example.multiactivity;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity2 extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.main2);
	}
}

3、MainActivity3

package com.example.multiactivity;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity3 extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.main3);
	}
}

4、在显示意图激活和隐式意图激活的过程中，其实AndroidManifest.xml文件是很重要的。故在此附上AndroidManifest.xml的全部代码：

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.multiactivity.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="com.example.multiactivity.MainActivity2"
            android:label="这是第二个Activity"
            />
        
        
        <activity android:name="com.example.multiactivity.MainActivity3">
            <intent-filter >
                <action android:name="hellointent"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <category android:name="asdasd"/>
                <data android:scheme="zhangzetian" android:mimeType="image/jpeg"/>
            </intent-filter>
            
        </activity>
    </application>

</manifest>

三、源码下载：

http://download.csdn.net/detail/caihongshijie6/7792167

(Android review)显示意图激活与隐式意图激活,,5-wow.com