Android 音乐播放器中显示歌曲的信息

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正文

首先，从database中获取歌曲的信息.

然后，应用SimpleAdapter 在ListActivity中显示这些信息。

在TrackBrowserActivity中长按一首歌曲，从ContextMenu中选择METADATA_INFO，就会启动MusicMetadataActivity，该Activity会显示歌曲的信息。

具体步骤如下:

1, 在packages\apps\Music\AndroidManifest.xml中添加MusicMetadataActivity:

<activity android:name="com.android.music.MusicMetadataActivity" android:exported="false"

android:theme="@android:style/Theme.Holo"

android:configChanges="orientation|screenSize" />

2, 在packages\apps\Music\res\layout\中新建布局文件music_metadata.xml :

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

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<ListView

android:id="@android:id/list"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:drawSelectorOnTop="false"

android:fastScrollEnabled="true"

android:scrollbars="none"/>

<TextView android:id="@+id/metadata_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="22dip"

android:textStyle="bold"

android:paddingLeft="6dip"

android:paddingTop="3dip"

android:paddingBottom="1dip"

android:gravity="center_vertical"/>

<TextView android:id="@+id/metadata_content"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="18dip"

android:textColor="@color/metadata_content"

android:paddingLeft="6dip"

android:paddingTop="1dip"

android:paddingBottom="1dip"

android:gravity="bottom"/>

</LinearLayout>

3, 在packages\apps\Music\res\values\colors.xml中添加颜色信息:

4, 在packages\apps\Music\res\values\mtk_strings.xml添加字串，并在各语言中添加对应的字串:

<string name="music_metadata_info">Music Info</string>

<string name="music_metadata_artist">Artist</string>

<string name="music_metadata_tile">Title</string>

<string name="music_metadata_album">Album</string>

<string name="music_metadata_duration">Duration</string>

<string name="music_metadata_genre">Genre</string>

<string name="music_metadata_recording_date">Recording Date</string>

<string name="music_metadata_number">Number</string>

<string name="music_metadata_format">Format</string>

<string name="music_metadata_emplacement">Emplacement</string>

<string name="music_metadata_info_unknown">Unknown</string>

5, 在packages\apps\Music\src\com\android\music\中创建MusicMetadataActivity.java:

package com.android.music;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.ActionBar;

import android.app.ListActivity;

import android.content.ContentUris;

import android.content.Intent;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.provider.MediaStore;

import android.view.MenuItem;

import android.widget.SimpleAdapter;

public class MusicMetadataActivity extends ListActivity{

private static final String TAG = "MusicMetadata";

private static final String METADATA_NAME = "metadataName";

private static final String METADATA_CONTENT = "metadataContent";

private List<Map<String, String>> mListItems = new ArrayList<Map<String, String>>();

private String mSelectedId;

private Cursor mCursor;

//Column Index

private int mTitleIdx;

private int mArtistIdx;

private int mAlbumIdx;

private int mDurationIdx;

private int mGenreIdx;

private int mYearIdx;

private int mTrackNoIdx;

private int mMimeTypeIdx;

private int mSizeIdx;

private int mEmplacementIdx;

//meta data

private String mTitle;

private String mArtist;

private String mAlbum;

private String mDuration;

private String mGenre;

private String mYear;

private String mTrackNo;

private String mMimeType;

private String mSize;

private String mEmplacement;

public MusicMetadataActivity()

{

}

@Override

public void onCreate(Bundle icicle) {

MusicLogUtils.d(TAG, "onCreate");

super.onCreate(icicle);

Intent intent = getIntent();

if (intent != null) {

mSelectedId = intent.getStringExtra("selected_id");

}

MusicLogUtils.d(TAG, "onCreate: selectedId = " + mSelectedId);

ActionBar actionBar = getActionBar();

actionBar.setDisplayHomeAsUpEnabled(true);

actionBar.setHomeButtonEnabled(true);

setContentView(R.layout.music_metadata);

//cursor column

String[] cursorCols = new String[] {

MediaStore.Audio.Media._ID,

MediaStore.Audio.Media.TITLE,

MediaStore.Audio.Media.ARTIST,

MediaStore.Audio.Media.ALBUM,

MediaStore.Audio.Media.DURATION,

MediaStore.Audio.Media.YEAR,

MediaStore.Audio.Media.TRACK,

MediaStore.Audio.Media.MIME_TYPE,

MediaStore.Audio.Media.SIZE,

MediaStore.Audio.Media.DATA

};

Uri uri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, Long.valueOf(mSelectedId));

Cursor mCursor = MusicUtils.query(this, uri, cursorCols, null, null, null);

getColumnIndicesFromDB(mCursor);

getMetadataFromDB(mCursor);

getGenre();

getAdapterData();

setTitle(mTitle);

initAdapter();

}

@Override

public void onDestroy() {

MusicLogUtils.d(TAG, "onDestroy");

if(mCursor != null){

mCursor.close();

mCursor = null;

}

super.onDestroy();

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case android.R.id.home:

/// M: Navigation button press back

MusicLogUtils.d(TAG, "onOptionsItemSelected: Navigation button press back");

finish();

return true;

default:

break;

}

return super.onOptionsItemSelected(item);

}

private void getColumnIndicesFromDB(Cursor cursor) {

MusicLogUtils.d(TAG, "getColumnIndices: cursor = " + cursor);

if(cursor != null){

if(cursor.moveToFirst() && cursor.getCount() > 0){

mTitleIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE);

MusicLogUtils.d(TAG, "getColumnIndices: mTitleIdx = " + mTitleIdx);

mArtistIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST);

MusicLogUtils.d(TAG, "getColumnIndices: mArtistIdx = " + mArtistIdx);

mAlbumIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM);

MusicLogUtils.d(TAG, "getColumnIndices: mAlbumIdx = " + mAlbumIdx);

mDurationIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION);

MusicLogUtils.d(TAG, "getColumnIndices: mDurationIdx = " + mDurationIdx);

mYearIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.YEAR);

MusicLogUtils.d(TAG, "getColumnIndices: mYearIdx = " + mYearIdx);

mTrackNoIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TRACK);

MusicLogUtils.d(TAG, "getColumnIndices: mTrackNoIdx = " + mTrackNoIdx);

mMimeTypeIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.MIME_TYPE);

MusicLogUtils.d(TAG, "getColumnIndices: mMimeTypeIdx = " + mMimeTypeIdx);

mSizeIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);

MusicLogUtils.d(TAG, "getColumnIndices: mSizeIdx = " + mSizeIdx);

mEmplacementIdx = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);

MusicLogUtils.d(TAG, "getColumnIndices: mEmplacementIdx = " + mEmplacementIdx);

}

private void getMetadataFromDB(Cursor cursor) {

MusicLogUtils.d(TAG, "getMetadataFromDB: cursor = " + cursor);

if(cursor != null){

if(cursor.moveToFirst() && cursor.getCount() > 0){

mTitle = cursor.getString(mTitleIdx);

MusicLogUtils.d(TAG, "getColumnIndices: mTitle = " + mTitle);

String artist = cursor.getString(mArtistIdx);

MusicLogUtils.d(TAG, "getColumnIndices: artist = " + artist);

if(MediaStore.UNKNOWN_STRING.equals(artist)){

artist = getString(R.string.unknown_artist_name);

MusicLogUtils.d(TAG, "getColumnIndices: artist = " + artist);

}

mArtist = artist;

String album = cursor.getString(mAlbumIdx);

MusicLogUtils.d(TAG, "getColumnIndices: album = " + album);

if(MediaStore.UNKNOWN_STRING.equals(album)){

album = getString(R.string.unknown_album_name);

MusicLogUtils.d(TAG, "getColumnIndices: album = " + album);

}

mAlbum = album;

long duration = cursor.getLong(mDurationIdx);

final int secondToMs = 1000;

MusicLogUtils.d(TAG, "getColumnIndices: duration = " + duration);

mDuration = MusicUtils.makeTimeString(this, duration / secondToMs);

int year = cursor.getInt(mYearIdx);

MusicLogUtils.d(TAG, "getColumnIndices: year = " + year);

if(year == 0){

mYear = getString(R.string.music_metadata_info_unknown);

}else{

mYear = String.valueOf(year);

}

MusicLogUtils.d(TAG, "getColumnIndices: mYear = " + mYear);

int trackNo = cursor.getInt(mTrackNoIdx);

MusicLogUtils.d(TAG, "getColumnIndices: trackNo = " + trackNo);

mTrackNo = String.valueOf(trackNo);

mMimeType = cursor.getString(mMimeTypeIdx);

MusicLogUtils.d(TAG, "getColumnIndices: mMimeType = " + mMimeType);

long size = cursor.getLong(mSizeIdx);

MusicLogUtils.d(TAG, "getColumnIndices: size = " + size);

mSize = MusicUtils.makeSizeString(size);

MusicLogUtils.d(TAG, "getColumnIndices: mSize = " + mSize);

mEmplacement = cursor.getString(mEmplacementIdx);

MusicLogUtils.d(TAG, "getColumnIndices: mEmplacement = " + mEmplacement);

}

private void getGenre(){

MusicLogUtils.d(TAG, "getGenre");

String[] cursorGenreCols = new String[]{

MediaStore.Audio.Genres._ID,

MediaStore.Audio.Genres.NAME

};

Uri uri = MediaStore.Audio.Genres.getContentUriForAudioId("external", Integer.valueOf(mSelectedId));

MusicLogUtils.d(TAG, "getGenre: uri = " + uri);

String genre = null;

Cursor genreCursor = MusicUtils.query(this, uri, cursorGenreCols, null, null, null);

MusicLogUtils.d(TAG, "getGenre: genreCursor = " + genreCursor);

if(genreCursor != null){

if(genreCursor.moveToFirst() && genreCursor.getCount() > 0){

int genreIdx = genreCursor.getColumnIndexOrThrow(MediaStore.Audio.Genres.NAME);

MusicLogUtils.d(TAG, "getGenre: nameIdx = " + genreIdx);

genre = genreCursor.getString(genreIdx);

MusicLogUtils.d(TAG, "getGenre: genre = " + genre);

}

genreCursor.close();

genreCursor = null;

}

MusicLogUtils.d(TAG, "getGenre: genreCursor");

if(genre == null){

mGenre = getString(R.string.music_metadata_info_unknown);

}else{

mGenre = genre;

}

MusicLogUtils.d(TAG, "getGenre: mGenre = " + mGenre);

}

private void getAdapterData(){

MusicLogUtils.d(TAG, "getAdapterData");

//metadata name string id

int[] metadataName = new int[]{

R.string.music_metadata_tile,

R.string.music_metadata_artist,

R.string.music_metadata_album,

R.string.music_metadata_duration,

R.string.music_metadata_genre,

R.string.music_metadata_recording_date,

R.string.music_metadata_number,

R.string.music_metadata_format,

R.string.music_metadata_size,

R.string.music_metadata_emplacement

};

//metadata content string

String[] metadataContent = new String[]{

mTitle,

mArtist,

mAlbum,

mDuration,

mGenre,

mYear,

mTrackNo,

mMimeType,

mSize,

mEmplacement

};

for(int i = 0; i < metadataName.length; i++){

Map<String, String> listItem = new HashMap<String, String>();

listItem.put(METADATA_NAME, getString(metadataName[i]));

listItem.put(METADATA_CONTENT, metadataContent[i]);

mListItems.add(listItem);

}

private void initAdapter(){

MusicLogUtils.d(TAG, "initAdapter");

String[] from = new String[]{METADATA_NAME, METADATA_CONTENT};

int[] to = new int[]{R.id.metadata_name, R.id.metadata_content};

SimpleAdapter simpleAdapter = new SimpleAdapter(this, mListItems, R.layout.music_metadata, from, to);

setListAdapter(simpleAdapter);

}

6, 在packages\apps\Music\src\com\android\music\ MusicUtils.java中添加转换时间格式的方法:

public static final String UNIT_B = "B";

public static final String UNIT_KB = "KB";

public static final String UNIT_MB = "MB";

public static final String UNIT_GB = "GB";

public static final String UNIT_TB = "TB";

private static final int UNIT_INTERVAL = 1024;

private static final double ROUNDING_OFF = 0.005;

private static final int DECIMAL_NUMBER = 100;

/**

* This method converts a size to a string

* @param size the size of a file

* @return the string represents the size

public static String makeSizeString(long size) {

String unit = UNIT_B;

if (size < DECIMAL_NUMBER) {

MusicLogUtils.d(TAG, "makeSizeString(),size = " + size);

return Long.toString(size) + " " + unit;

}

unit = UNIT_KB;

double sizeDouble = (double) size / (double) UNIT_INTERVAL;

if (sizeDouble > UNIT_INTERVAL) {

sizeDouble = (double) sizeDouble / (double) UNIT_INTERVAL;

unit = UNIT_MB;

}

if (sizeDouble > UNIT_INTERVAL) {

sizeDouble = (double) sizeDouble / (double) UNIT_INTERVAL;

unit = UNIT_GB;

}

if (sizeDouble > UNIT_INTERVAL) {

sizeDouble = (double) sizeDouble / (double) UNIT_INTERVAL;

unit = UNIT_TB;

}

// Add 0.005 for rounding-off.

long sizeInt = (long) ((sizeDouble + ROUNDING_OFF) * DECIMAL_NUMBER); // strict to two

// decimal places

double formatedSize = ((double) sizeInt) / DECIMAL_NUMBER;

MusicLogUtils.d(TAG, "makeSizeString(): " + formatedSize + unit);

if (formatedSize == 0) {

return "0" + " " + unit;

} else {

return Double.toString(formatedSize) + " " + unit;

}

7, 在packages\apps\Music\src\com\android\music\ TrackBrowserActivity.java中添加启动MusicMetadataActivity的入口:

a, 定义启动MusicMetadataActivity的menu item:

private static final int METADATA_INFO = CHILD_MENU_BASE + 10;

b, 在onCreateContextMenu()中添加该menu item:

menu.add(0, METADATA_INFO, 0, R.string.music_metadata_info);

c, 在onContextItemSelected()执行启动MusicMetadataActivity的操作:

case METADATA_INFO:

Intent intent = new Intent();

intent.setClass(this, MusicMetadataActivity.class);

intent.putExtra("selected_id", String.valueOf(mSelectedId));

MusicLogUtils.d(TAG, "METADATA_INFO: mSelectedPosition = " + mSelectedPosition);

MusicLogUtils.d(TAG, "METADATA_INFO: mSelectedId = " + mSelectedId);

startActivityForResult(intent, -1);