Android 隐性Intent的例子

Android的Intent分为两大类，显性的(Explicit )的和隐性的(Implicit)。 
显性的很简单就是我们常用的Activit跳转，他指明了从一个Activity跳转到另一个。 

在SecondActivity这个配置中有一个intent-filter，其中它定义了action的名称。所谓的隐性Intent就是靠这个action的名称来传递。 
代码如下：

标签： Android SDK  Intent

[1].[代码] 显式 跳至 [1] [2] [3] [4]

Intent i = new Intent( this ,AnotherActivity. class );
startActivity(i);

[2].[代码] Main.java 跳至 [1] [2] [3] [4]

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

public class Main extends Activity {
private final String mapSearchIntent = "com.decarta.mapsearch.intent.action.SEARCH" ;

/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
Uri mapUri = Uri.parse( "geo:39.906033,116.397700" );
Intent i = new Intent(mapSearchIntent, mapUri);
i.setData(mapUri);
startActivity(i);
}
}

[3].[代码] SecondActivity.java 跳至 [1] [2] [3] [4]

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

/**
* @author Tony Shen
*/

public class SecondActivity extends Activity{
private Uri data;
private String action;

/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
Intent intent = getIntent();
if (intent.getAction() != null )
action = intent.getAction();
if (intent.getData()!= null )
data = intent.getData();
if (action.equals( "com.decarta.mapsearch.intent.action.SEARCH" )) {
Intent i = new Intent(Intent.ACTION_VIEW, data);
startActivity(i);
}
}
}

[4].[代码] [XML]代码 跳至 [1] [2] [3] [4]

< application android:icon = "@drawable/icon" android:label = "@string/app_name" >
< activity android:name = ".Main" 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 = ".SecondActivity" >
< intent-filter >
< action android:name = "com.decarta.mapsearch.intent.action.SEARCH" />
< category android:name = "android.intent.category.DEFAULT" />
< data android:scheme = "geo" />
intent-filter >
activity >
application >
< application android:icon = "@drawable/icon" android:label = "@string/app_name" >
< activity android:name = ".Main" 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 = ".SecondActivity" >
< intent-filter >
< action android:name = "com.decarta.mapsearch.intent.action.SEARCH" />
< category android:name = "android.intent.category.DEFAULT" />
< data android:scheme = "geo" />
intent-filter >
activity >
application >