我需要獲取手機某處文件的完整路徑(任意位置)並使用MediaPlayer播放。Android MediaPlayer文件的完整路徑
我聽說過使用Android的文件選擇器(通過啓動一個intent)。
在測試代碼中,我只是複製的資源到另一個文件,得到了路徑,將其傳遞給AudioVideoEntry(如我以後,周圍的MediaPlayer一個非常簡單的和瘦包裝)
這裏的測試代碼我已經寫了:
private String ave_path;
private String ave_file_name = "my_media_content";
private InputStream ave_fis;
private OutputStream ave_fos;
public void testAudioVideoEntry()
{
//get the Activity
Module_JournalEntry journalentryactivity = getActivity();
//open an InputStream to a resource file (in this case strokes.mp3)
ave_fis = journalentryactivity.getResources().openRawResource(module.jakway.JournalEntry.R.raw.strokes);
//open an OutputStream to a new file
try {
ave_fos = journalentryactivity.openFileOutput(ave_file_name,
Context.MODE_PRIVATE);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
assertTrue(false);
}
catch(Exception e)
{
assertTrue(false);
}
//copy the data from the resource into
//the OutputStream
int data;
try {
while((data = ave_fis.read()) != -1)
{
ave_fos.write(data);
}
assertTrue(true);
}
catch(Exception e)
{
assertTrue(false);
}
//get the full path of the file we wrote to
ave_path = journalentryactivity.getFileStreamPath(ave_file_name).toString();
//and construct a new object of AudioVideoEntry with that path
AudioVideoEntry ave = new AudioVideoEntry(ave_path);
//register an error listener via MediaPlayer's setOnErrorListener
ave.setOnErrorListener(new OnErrorListener()
{
@Override
public boolean onError(MediaPlayer mp,
int what, int extra) {
Log.e("MEDIAPLAYER ERRORS",
"what: " + what + " extra: " + extra);
assertTrue(false);
// TODO Auto-generated method stub
return false;
}
});
ave.prepareMedia();
ave.playMedia();
try {
ave_fis.close();
ave_fos.close();
}
catch(Exception e)
{
assertTrue(false);
e.printStackTrace();
}
AudioVideoEntry基本上是圍繞MediaPlayer的瘦包裝,可容納自己的道路:
public class AudioVideoEntry
{
private String path_to_audio_file;
private MediaPlayer mediaplayer;
/**
* Initialize the internal MediaPlayer
* from the String parameter
* @param set_path_to_audio_file
*/
public AudioVideoEntry(String set_path_to_audio_file)
{
path_to_audio_file = set_path_to_audio_file;
mediaplayer = new MediaPlayer();
try {
mediaplayer.setDataSource(path_to_audio_file);
mediaplayer.prepare();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public AudioVideoEntry(FileDescriptor fd)
{
mediaplayer = new MediaPlayer();
try {
mediaplayer.setDataSource(fd);
mediaplayer.prepare();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Begin playing media
*/
public void prepareMedia()
{
try {
mediaplayer.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* play media
* don't forget to prepare() if necessary
*/
public void playMedia()
{
mediaplayer.start();
}
/**
* pause the media
* can be played later
*/
public void pauseMedia()
{
mediaplayer.pause();
}
/**
* stop media
*/
public void stopMedia()
{
mediaplayer.stop();
}
public void setOnErrorListener(OnErrorListener listener)
{
mediaplayer.setOnErrorListener(listener);
}
}
這裏的logcat的輸出F ROM JUnit測試(測試是成功的,實際的結果 - 作爲logat表演 - 沒有)
02-07 09:40:23.129: ERROR/MediaPlayer(1209): error (1, -2147483648)
02-07 09:40:23.139: WARN/System.err(1209): java.io.IOException: Prepare failed.: status=0x1
02-07 09:40:23.149: WARN/System.err(1209): at android.media.MediaPlayer.prepare(Native Method)
02-07 09:40:23.149: WARN/System.err(1209): at module.jakway.JournalEntry.AudioVideoEntry.<init>(AudioVideoEntry.java:39)
02-07 09:40:23.149: WARN/System.err(1209): at module.jakway.JournalEntry.test.Module_JournalEntryTest.testAudioVideoEntry(Module_JournalEntryTest.java:182)
02-07 09:40:23.149: WARN/System.err(1209): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 09:40:23.149: WARN/System.err(1209): at java.lang.reflect.Method.invoke(Method.java:507)
02-07 09:40:23.159: WARN/System.err(1209): at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
02-07 09:40:23.159: WARN/System.err(1209): at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
02-07 09:40:23.159: WARN/System.err(1209): at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
02-07 09:40:23.159: WARN/System.err(1209): at junit.framework.TestCase.runBare(TestCase.java:127)
02-07 09:40:23.169: WARN/System.err(1209): at junit.framework.TestResult$1.protect(TestResult.java:106)
02-07 09:40:23.169: WARN/System.err(1209): at junit.framework.TestResult.runProtected(TestResult.java:124)
02-07 09:40:23.169: WARN/System.err(1209): at junit.framework.TestResult.run(TestResult.java:109)
02-07 09:40:23.179: WARN/System.err(1209): at junit.framework.TestCase.run(TestCase.java:118)
02-07 09:40:23.179: WARN/System.err(1209): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
02-07 09:40:23.179: WARN/System.err(1209): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
02-07 09:40:23.179: WARN/System.err(1209): at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:529)
02-07 09:40:23.189: WARN/System.err(1209): at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
02-07 09:40:23.189: ERROR/MediaPlayer(1209): prepareAsync called in state 0
02-07 09:40:23.189: WARN/System.err(1209): java.lang.IllegalStateException
02-07 09:40:23.189: WARN/System.err(1209): at android.media.MediaPlayer.prepare(Native Method)
02-07 09:40:23.189: WARN/System.err(1209): at module.jakway.JournalEntry.AudioVideoEntry.prepareMedia(AudioVideoEntry.java:79)
02-07 09:40:23.199: WARN/System.err(1209): at module.jakway.JournalEntry.test.Module_JournalEntryTest.testAudioVideoEntry(Module_JournalEntryTest.java:197)
02-07 09:40:23.199: WARN/System.err(1209): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 09:40:23.199: WARN/System.err(1209): at java.lang.reflect.Method.invoke(Method.java:507)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
02-07 09:40:23.199: WARN/System.err(1209): at junit.framework.TestCase.runBare(TestCase.java:127)
02-07 09:40:23.199: WARN/System.err(1209): at junit.framework.TestResult$1.protect(TestResult.java:106)
02-07 09:40:23.199: WARN/System.err(1209): at junit.framework.TestResult.runProtected(TestResult.java:124)
02-07 09:40:23.199: WARN/System.err(1209): at junit.framework.TestResult.run(TestResult.java:109)
02-07 09:40:23.199: WARN/System.err(1209): at junit.framework.TestCase.run(TestCase.java:118)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
02-07 09:40:23.199: WARN/System.err(1209): at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:529)
02-07 09:40:23.199: WARN/System.err(1209): at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
02-07 09:40:23.199: ERROR/MediaPlayer(1209): start called in state 0
02-07 09:40:23.199: ERROR/MediaPlayer(1209): error (-38, 0)
編輯:爲什麼MediaPlayer的失敗?
謝謝! dragonwrenn
如果在那裏有一個問題,我沒有看到它... – androidworkz 2011-02-07 18:13:14
爲什麼我得到錯誤? – Prime 2011-02-08 03:49:15