IntentFilterDemo

intent-filter示例：

<activity
     android:name=".CustomActivity"
     android:label="@string/title_activity_custom" >
     <intent-filter>
         <action android:name="android.intent.action.VIEW"></action>
         <action android:name="com.example.shad_fnst.intentfilterdemo.LAUNCH"></action>
         <category android:name="android.intent.category.DEFAULT"></category>
         <data android:scheme="http"></data>
     </intent-filter>
 </activity>

CustomActivity可以过滤接收到action是android.intent.action.VIEW或com.example.shad_fnst.intentfilterdemo.LAUNCH，以及data是http的Intent，
并作出响应。系统中的其他APP也可以过滤接收到MainActivity中的Intent，并作出响应，例如浏览器。

 package com.example.shad_fnst.intentfilterdemo;

 import android.app.Activity;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;

 public class MainActivity extends Activity {

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

         Button startBrowser_a = (Button) findViewById(R.id.start_browser_a);
         startBrowser_a.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent(android.content.Intent.ACTION_VIEW,
                         Uri.parse("http://www.baidu.com"));
                 startActivity(intent);
             }
         });

         Button startBrowser_b = (Button) findViewById(R.id.start_browser_b);
         startBrowser_b.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent("com.example.shad_fnst.intentfilterdemo.LAUNCH",
                         Uri.parse("http://www.baidu.com"));
                 startActivity(intent);
             }
         });

         Button startBrowser_c = (Button) findViewById(R.id.start_browser_c);
         startBrowser_c.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent("com.example.shad_fnst.intentfilterdemo.LAUNCH",
                         Uri.parse("https://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.menu_main, menu);
         return true;
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
         // as you specify a parent activity in AndroidManifest.xml.
         int id = item.getItemId();

         //noinspection SimplifiableIfStatement
         if (id == R.id.action_settings) {
             return true;
         }

         return super.onOptionsItemSelected(item);
     }
 }

MainActivity.java

 package com.example.shad_fnst.intentfilterdemo;

 import android.app.Activity;
 import android.net.Uri;
 import android.os.Bundle;
 import android.widget.TextView;

 public class CustomActivity extends Activity {

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

         TextView label = (TextView) findViewById(R.id.show_data);
         Uri uri = getIntent().getData();
         label.setText(uri.toString());
     }
 }

CustomActivity.java

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

     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name=".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=".CustomActivity"
             android:label="@string/title_activity_custom" >
             <intent-filter>
                 <action android:name="android.intent.action.VIEW"></action>
                 <action android:name="com.example.shad_fnst.intentfilterdemo.LAUNCH"></action>
                 <category android:name="android.intent.category.DEFAULT"></category>
                 <data android:scheme="http"></data>
             </intent-filter>
         </activity>
     </application>

 </manifest>

AndroidManifest.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent"
     android:layout_height="fill_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
     android:orientation="vertical">

     <Button
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:id="@+id/start_browser_a"
         android:text="@string/start_browser_a"/>

     <Button
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:id="@+id/start_browser_b"
         android:text="@string/start_browser_b"/>

     <Button
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:id="@+id/start_browser_c"
         android:text="@string/start_browser_c"/>

 </LinearLayout>

activity_main.xml

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
     android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
     tools:context="com.example.shad_fnst.intentfilterdemo.CustomActivity">

     <TextView
         android:layout_width="fill_parent"
         android:layout_height="400dp"
         android:id="@+id/show_data"/>

 </RelativeLayout>

activity_custom.xml

 <resources>
     <string name="app_name">IntentFilterDemo</string>

     <string name="hello_world">Hello world!</string>
     <string name="action_settings">Settings</string>
     <string name="start_browser_a">Start Browser with VIEW action</string>
     <string name="start_browser_b">Start Browser with LAUNCH action</string>
     <string name="start_browser_c">Exception Condition</string>
     <string name="title_activity_custom">CustomActivity</string>
 </resources>

strings.xml