intent过滤器相关选项

如果多个activity有同样的一个action的情况，在启用的情况下使用同一个intent.action启用该是怎样的一个情况

androidManifest.xml

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

    <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=".AnoAct"
            android:label="LongPra" >
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT" />
                <!-- android.intent.category.DEFAULT指名这个intent-filter这个行为方式为一个activity -->
                <action android:name="com.example.root.longpra.intent.action.AnoAct" />
                <!-- action可以为任意字符串，只要在启动的过程启用这个字符串即可 -->
            </intent-filter>
>
        </activity>
>
        <activity
            android:name=".MyAty1"
            android:label="@string/title_activity_my_aty1" >
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT"/>
                <action android:name="com.example.root.longpra.intent.action.AnoAct"/>
            </intent-filter>>
        </activity>
    </application>
//两个activity使用同一个action启动
</manifest>

MainActivity.java

package com.example.root.longpra;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);/*绑定activity*/
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(AnoAct.ACTION));
                /*像这种很明确的指出了被启动的类的定义的就是显示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);
    }
}

AnoAct.java

package com.example.root.longpra;

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

/**
 * Created by root on 15-8-22.
 */
public class AnoAct extends Activity {
    public static final String ACTION = "com.example.root.longpra.intent.action.AnoAct";//在这边定义这个字符串微一个常量，这样当外面需要调用这个activity时候可以直接使用ACTION
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.anoact);/*绑定anoact*/
    }
}

MyAty1.java

package com.example.root.longpra;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MyAty1 extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_aty1);
    }

    @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_my_aty1, 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);
    }
}

在app1中

package com.example.root.app1;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent("com.example.root.longpra.intent.action.AnoAct"));
            }
        });
    }

    @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);
    }
}

当启动好app，再次启动app1，那么运行的界面会让你选择运行哪一个action。

那么问题来了，如果是相同的action但是我想启动指定的activity该怎么办呢？

首先在xml中定义一个协议，在你需要启动的activity的xml的intent-filter中添加

<data android:scheme="app"/>
并在启用action的地方intent中参数修改为，添加Uri.parse("app://可事实任意的参数")
startActivity(new Intent("com.example.root.longpra.intent.action.AnoAct", Uri.parse("app://hello")));
这样就默认启动了设置好的activity

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