Android RingtoneManager铃声管理

package com.Aina.Android;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;

public class Test extends Activity {
	/** Called when the activity is first created. */
	private Button btn1 = null;
	private Button btn2 = null;
	private Button btn3 = null;
	private static final int Ringtone = 0;
	private static final int Alarm = 1;
	private static final int Notification = 2;
	private static final String FileRingtone = Environment
			.getExternalStorageDirectory()
			+ "/music/ringtones";
	private static final String FileAlarm = Environment
			.getExternalStorageDirectory()
			+ "/music/alarms";
	private static final String FileNotification = Environment
			.getExternalStorageDirectory()
			+ "/music/notifications";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		btn1 = (Button) this.findViewById(R.id.Button01);
		btn2 = (Button) this.findViewById(R.id.Button02);
		btn3 = (Button) this.findViewById(R.id.Button03);
		btn1.setOnClickListener(new Button.OnClickListener() {

			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				if (isFile(FileRingtone)) {
					// 打开系统铃声设置
					Intent intent = new Intent(
							RingtoneManager.ACTION_RINGTONE_PICKER);
					// 设置类型为来电
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE,
							RingtoneManager.TYPE_RINGTONE);
					// 设置显示的标题
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE,
							"设置来电铃声");
					startActivityForResult(intent, Ringtone);
				}
			}

		});
		btn2.setOnClickListener(new Button.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				if (isFile(FileAlarm)) {
					Intent intent = new Intent(
							RingtoneManager.ACTION_RINGTONE_PICKER);
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE,
							RingtoneManager.TYPE_ALARM);
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE,
							"设置闹钟铃声");
					startActivityForResult(intent, Alarm);
				}
			}

		});
		btn3.setOnClickListener(new Button.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				if (isFile(FileNotification)) {
					Intent intent = new Intent(
							RingtoneManager.ACTION_RINGTONE_PICKER);
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE,
							RingtoneManager.TYPE_NOTIFICATION);
					intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE,
							"设置通知铃声");
					startActivityForResult(intent, Notification);
				}

			}

		});
	}

	/**
	 * 设置铃声之后的回调函数
	 */
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode != RESULT_OK) {
			return;
		} else {
			// 得到我们选择的铃声
			Uri uri = data
					.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
			if (uri != null) {
				switch (requestCode) {
				case Ringtone:
					RingtoneManager.setActualDefaultRingtoneUri(this,
							RingtoneManager.TYPE_RINGTONE, uri);
					break;
				case Alarm:
					RingtoneManager.setActualDefaultRingtoneUri(this,
							RingtoneManager.TYPE_ALARM, uri);
					break;
				case Notification:
					RingtoneManager.setActualDefaultRingtoneUri(this,
							RingtoneManager.TYPE_NOTIFICATION, uri);
					break;
				default:
					break;
				}
			}

		}
	}

	/**
	 * 判断文件是否存在，不存在则创建.
	 * 
	 * @param path
	 * @return
	 */
	private boolean isFile(String path) {
		boolean b = false;
		File f = new File(path);
		if (f.exists()) {
			b = true;
		} else {
			if (f.mkdirs()) {
				b = true;
			} else {
				b = false;
			}
		}
		return b;
	}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<TextView android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="@string/hello" />
	<Button android:text="设置来电铃声" android:id="@+id/Button01"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</Button>
	<Button android:text="设置闹钟铃声" android:id="@+id/Button02"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</Button>
	<Button android:text="设置通知铃声" android:id="@+id/Button03"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content">
	</Button>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.Aina.Android"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Test"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

</manifest>