<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.genwoxue.pictureviewer"

    android:versionCode="1"

    android:versionName="1.0" >  

    <uses-sdk

        android:minSdkVersion="10"

        android:targetSdkVersion="15" />  

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.genwoxue.pictureviewer.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.GET_CONTENT" />

                <category android:name="android.intent.category.DEFAULT" />

                <category android:name="android.intent.category.OPENABLE" />

                <data android:mimeType="image/jpeg" />

            </intent-filter>  

        </activity>

    </application>  

</manifest>  

mport android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;  

public class MainActivity extends Activity {  

    private Button btnChoose=null;

    @Override

     public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnChoose=(Button)super.findViewById(R.id.choose);

        btnChoose.setOnClickListener(new OnClickListener(){

            public void onClick(View v)

            {

                //系统会把所有查看Image类型的应用显示在列表中

                Intent intent=new Intent();

                intent.setAction(Intent.ACTION_GET_CONTENT);

                intent.setType("image/*");

                MainActivity.this.startActivity(intent.createChooser(intent, "选择图片查看APP"));

            }

        });

    }

}