我开发了一个简单的 Android 应用程序，它将从 path="storage/MicroSD/Videos" 并将它们显示在列表视图中，选择视频后，将播放所选视频。播放位于存储/MicroSD/视频中的视频。但其他路径中的视频不会被获取。请给出一些想法，如何从所有路径（内部存储和外部存储）获取视频。此外，如果我在不同的手机上运行相同的应用程序，SD 卡路径会有所不同，如
Storage/SD Card o/videosFile主要活动
public class MainActivity extends Activity {
private ListView mListView;
private List<String> fileNameList;
public String path="storage/MicroSD/Videos";
private File file;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
file = Environment.getExternalStorageDirectory();
fileNameList = getFileListfromSDCard();
final ListView listView = (ListView) findViewById(R.id.list);
ArrayAdapter<String> adapter1 = new ArrayAdapter<String> (this,android.R.layout.simple_list_item_1, android.R.id.text1, fileNameList);
listView.setAdapter(adapter1);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
int itemPosition = position;
String itemValue = (String) listView.getItemAtPosition(position);
Intent intent = new Intent(MainActivity.this, com.video.videolibrary.SelectedVideo.class);
intent.putExtra("id", id);
intent.putExtra("itemValue", itemValue);
intent.putExtra("path", path);
startActivity(intent);
}
});
Button button = (Button) findViewById(R.id.btn_Online);
// Capture button clicks
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent myIntent = new Intent(MainActivity.this,com.video.videolibrary.SelectedVideo.class);
startActivity(myIntent);
}
});
}
private List<String> getFileListfromSDCard() {
File files = new File(path);
FileFilter filter = new FileFilter() {
private final List<String> exts = Arrays.asList("mp4","MP4");
@Override
public boolean accept(File pathname) {
String ext;
String path = pathname.getPath();
ext = path.substring(path.lastIndexOf(".") + 1);
return exts.contains(ext);
}
};
final File [] filesFound = files.listFiles(filter);
List<String> flLst = new ArrayList<String>();
if (filesFound != null && filesFound.length > 0) {
for (File file : filesFound) {
flLst.add(file.getName());
}
}
return flLst;
}
}
所选视频课程
public class SelectedVideo extends Activity {
VideoView view;AudioManager audioManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.selected_video);
view = (VideoView)findViewById(R.id.videoView1);
Bundle bundle = getIntent().getExtras();
String path=bundle.getString("path");
String itemValue = bundle.getString("itemValue");
view.setVideoURI(Uri.parse(path+"/"+itemValue ));
VideoView videoView = (VideoView) findViewById(R.id.videoView1);
MediaController mediaController = new MediaController(this);
mediaController.setAnchorView(videoView);
Uri uri = Uri.parse(path+"/"+itemValue);
DisplayMetrics dm = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(dm);
int height = dm.heightPixels;
int width = dm.widthPixels;
videoView.setMinimumWidth(width);
videoView.setMinimumHeight(height);
videoView.setMediaController(mediaController);
videoView.setVideoURI(uri);
videoView.requestFocus();
audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
SeekBar volControl = (SeekBar)findViewById(R.id.volbar);
volControl.setMax(maxVolume);
volControl.setProgress(curVolume);
volControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
// TODO Auto-generated method stub
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, arg1, 0);
}
});
Button stopbutton = (Button) findViewById(R.id.btn_stop);
stopbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
view.pause();
}
});
Button playbutton = (Button) findViewById(R.id.btn_play);
playbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Bundle bundle = getIntent().getExtras();
String itemValue = bundle.getString("itemValue");
Toast.makeText(getApplicationContext(),
itemValue, Toast.LENGTH_LONG)
.show();
view.start();
}
});
Button backbutton = (Button) findViewById(R.id.btn_back);
backbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
view.stopPlayback();
startActivity(new Intent(SelectedVideo.this, MainActivity.class));
}
});
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}
Android 清单文件
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.read_external_storage" />
<application
android:allowBackup="true"
android:icon="@mipmap/video_library"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:configChanges="orientation|keyboardHidden">
<activity
android:name="com.video.videolibrary.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>
<activity
android:name=".SelectedVideo">
</activity>
</application>
</manifest>
首先：不要硬编码 SD 卡的路径。您应该使用
getExternalStorageDirectory ()FilefilesFile files= Environment.getExternalStorageDirectory(Environment.DIRECTORY_MOVIES);
由于这将返回默认位置，用户可以访问的视频将存储在该位置，因此这个位置应该可以满足您的需求。
android api 对此表示：
注意：不要对这里的“外部”一词感到困惑。这个目录 可以更好地将其视为媒体/共享存储。它是一个文件系统 可以容纳相对大量的数据，并且可以在多个系统之间共享 所有应用程序（不强制执行权限）。传统上这是 SD 卡，但也可以作为内置存储器实现 设备与受保护的内部存储不同，并且可以 作为文件系统安装在计算机上。
另一种选择是使用
ContentProvider基本的
CursorCursor cursor=getContentResolver().query(
MediaStore.Video.Media, // The content URI of the table
mProjection, // The columns to return for each row
mSelectionClause, // Selection criteria
null, // replacing placeholders of Selection criterias
mSortOrder); // The sort order for the returned rows
while(cursor.moveToNext()){
//work with your data here
}
从 Android-Manifest.xml 中删除此行，这是不必要的：
<uses-permission android:name="android.permission.read_external_storage" />
试试这个：
String path = Environment.getExternalStorageDirectory().toString();
// String path = "Environment.getExternalStorageDirectory().toString()+"/myvideo";
ArrayList<String>alPath=new ArrayList<String>();
ArrayList<String> alName=new ArrayList<String>();
File directory = new File(path);
File[] file = directory.listFiles();
for (int i = 0; i < file.length; i++) {
alName.add(file[i].getName());
alPath.add(file[i].getAbsolutePath());
ArrayAdapter<String> arrayAdapter=new ArrayAdapter<String>
(VideoList.this,android.R.layout.simple_list_item_1,alName);
listView.setAdapter(arrayAdapter);