我们已经知道，一个activity通过使用Intent对象调用另外一个activity。为了能让其他activity做出回应，还需要在AndroidManifest.xml中配置<intent-filter>元素，同时指定action和category。例如：
<intent-filter >
<action android:name="net.learn2develop.SecondActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
1.新建一个工程，创建一个类：MyBrowserActivity.java。同时在res/layout中创建一个xml文件：brwoser.xml。
2.AndroidManifest.xml
<?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中添加一个Button元素。<?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 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 <?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 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.调试。
8.点击“Launch my Browser”按钮，将会看到一个新的activity，并且显示了Amazon.com网站的网页。
