android 把SD卡上的音乐文件用ListActivity显示出来 （eclipse）

啥也不说了 先来个效果图

发这个博的原因是我在网上找了很久才找到类似的，一直搞不明白，走了不少弯路

希望能帮到有需要的人



xml文件内容

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

<LinearLayout 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:orientation="vertical"

tools:context=".MainActivity" >

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="horizontal">

<TextView

android:id="@+id/tv_id"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:text="1" />

</LinearLayout>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical">

<TextView

android:id="@+id/tv_title"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:paddingRight="20dp"

android:textColor="#000000"

android:textSize="20sp"

android:text="1" />

<TextView

android:id="@+id/tv_singer"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:textSize="20sp"

android:text="1" />

<TextView

android:id="@+id/tv_album"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:text="1" />

<TextView

android:id="@+id/tv_size"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:text="1" />

<TextView

android:id="@+id/tv_duration"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:text="1" />

<TextView

android:id="@+id/tv_url"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="#000000"

android:text="1" />

</LinearLayout>

</LinearLayout>

Java文件内容

package com.example.mymusicvideo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.Activity;

import android.app.ListActivity;

import android.content.ContentResolver;

import android.database.Cursor;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.provider.MediaStore;

import android.support.v4.widget.SimpleCursorAdapter;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends ListActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.activity_main);

mysongshow();

}

public void mysongshow(){

ContentResolver cr = getApplication().getContentResolver();

if (cr == null) {

return;

}

// 获取所有歌曲

Cursor cursor = cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,

null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);

if (null == cursor) {

return;

}

//获取到集合数据

List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();

if (cursor.moveToFirst()) {

do{

int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));

String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));

String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));

String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));

long size = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));

int duration = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));

String url = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));

HashMap<String, Object> item = new HashMap<String, Object>();

item.put("music_id", id);

item.put("music_title", title);

item.put("music_singer", singer);

item.put("music_album",album);

item.put("music_size", size);

item.put("music_duration", duration);

item.put("music_path", url);

data.add(item);

}while(cursor.moveToNext());

}

String[] from = {"music_id","music_title","music_singer","music_album","music_size","music_duration","music_path"};

int[] to= {R.id.tv_id,R.id.tv_title,R.id.tv_singer,R.id.tv_album,R.id.tv_size,R.id.tv_duration,R.id.tv_url};

@SuppressWarnings("deprecation")

SimpleAdapter adapter = new SimpleAdapter(this,data

,R.layout.activity_main,from,to);

ListView listView = getListView();

listView.setAdapter(adapter);

// listView.setBackgroundColor(Color.parseColor("#000000"));//设置界面即listView的背景颜色为黑色

listView.setBackgroundResource(R.drawable.listview_background);//为界面添加背景图片

listView.setDividerHeight(50);//分割线的高度

//处理图片大小

Drawable drawable1 = getResources().getDrawable(R.drawable.a007);

drawable1.setBounds(2, 2, 2, 2);//第一0是距左边距离，第二0是距上边距离，40分别是长宽

//设置分割线的背景图片

listView.setDivider(drawable1);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.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();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}

获取SD卡权限（十分重要，这是获取音乐文件的钥匙）添加红色代码

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

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

package="com.example.mymusicvideo"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="19"

android:targetSdkVersion="19" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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

<application

android:allowBackup="true"

android:icon="@drawable/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>

</application>

</manifest>