Android新手入門教程（十八）：使用Intent調用“內置”應用の配置Intent-Filter – Android移動開發技術文章_手機開發 Android移動開發教學課程

我們已經知道，一個activity通過使用Intent對象調用另外一個activity。為瞭能讓其他activity做出回應，還需要在AndroidManifest.xml中配置<intent-filter>元素，同時指定action和category。例如：

[java] <intent-filter > 
    <action android:name="net.learn2develop.SecondActivity" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
</intent-filter> 
            <intent-filter >
                <action android:name="net.learn2develop.SecondActivity" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

1.新建一個工程，創建一個類：MyBrowserActivity.java。同時在res/layout中創建一個xml文件：brwoser.xml。

2.AndroidManifest.xml

[java] <?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="net.learn2develop.Intents" 
    android:versionCode="1" 
    android:versionName="1.0" > 
 
    <uses-sdk android:minSdkVersion="14" /> 
    <uses-permission android:name="android.permission.CALL_PHONE"/> 
    <uses-permission android:name="android.permission.INTERNET"/> 
    <application 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" > 
        <activity 
            android:label="@string/app_name" 
            android:name=".IntentsActivity" > 
            <intent-filter > 
                <action android:name="android.intent.action.MAIN" /> 
                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity> 
         
               
        <activity android:name=".MyBrowserActivity" 
                  android:label="@string/app_name"> 
            <intent-filter> 
                <action android:name="android.intent.action.VIEW" /> 
                <action android:name="net.learn2develop.MyBrowser" /> 
                <category android:name="android.intent.category.DEFAULT" /> 
                <data android:scheme="http" /> 
            </intent-filter> 
        </activity> 
         
             
    </application> 
 
</manifest> 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="net.learn2develop.Intents"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="14" />
    <uses-permission android:name="android.permission.CALL_PHONE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".IntentsActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
             
        <activity android:name=".MyBrowserActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="net.learn2develop.MyBrowser" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="http" />
            </intent-filter>
        </activity>
       
           
    </application>

</manifest>3.在main.xml中添加一個Button元素。

[java] <?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 
 
    <Button 
        android:id="@+id/btn_launchMyBrowser" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:onClick="onClickLaunchMyBrowser" 
        android:text="Launch My Browser" /> 
 
</LinearLayout> 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btn_launchMyBrowser"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickLaunchMyBrowser"
        android:text="Launch My Browser" />

</LinearLayout>4.IntentsActivity.java

[java] package net.learn2develop.Intents; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.View; 
 
public class IntentsActivity extends Activity { 
 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
    } 
     
    public void onClickLaunchMyBrowser(View view) { 
        Intent i = new Intent("net.learn2develop.MyBrowser"); 
                i.setData(Uri.parse("http://www.amazon.com")); 
                startActivity(i);        
    } 
     
} 
package net.learn2develop.Intents;

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

public class IntentsActivity extends Activity {

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 }
 
 public void onClickLaunchMyBrowser(View view) {
  Intent i = new Intent("net.learn2develop.MyBrowser");
                i.setData(Uri.parse("http://www.amazon.com"));
                startActivity(i);  
 }
 
}5.browser.xml

[java] <?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 
 
    <WebView 
        android:id="@+id/WebView01" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" /> 
 
</LinearLayout> 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <WebView
        android:id="@+id/WebView01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>6.MyBorwserActivity.java

[java] package net.learn2develop.Intents; 
 
import android.app.Activity; 
import android.net.Uri; 
import android.os.Bundle; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
 
public class MyBrowserActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.browser); 
 
        Uri url = getIntent().getData(); 
        WebView webView = (WebView) findViewById(R.id.WebView01); 
        webView.setWebViewClient(new Callback()); 
        webView.loadUrl(url.toString()); 
    } 
 
    private class Callback extends WebViewClient { 
        @Override 
        public boolean shouldOverrideUrlLoading(WebView view, String url) { 
            return (false); 
        } 
    } 
} 
package net.learn2develop.Intents;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MyBrowserActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.browser);

        Uri url = getIntent().getData();
        WebView webView = (WebView) findViewById(R.id.WebView01);
        webView.setWebViewClient(new Callback());
        webView.loadUrl(url.toString());
    }

    private class Callback extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            return (false);
        }
    }
}
7.調試。

8.點擊“Launch my Browser”按鈕，將會看到一個新的activity，並且顯示瞭Amazon.com網站的網頁。

摘自  horsttnann的專欄