这篇文章主要介绍Android如何选择图片或视频进行循环播放，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
项目要求对本地图片或者视频进行轮播，功能实现完成后发现只是在模拟器上运行ok,后来发现是文件路径的原因。
文件uri的头部有两种一种是以file开头一种是以content开头要进行判断转化
实现如下：
视频 点击吊起文件查看：
private void setVideoPath() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");//设置类型，我这里是任意类型，任意后缀的可以这样写。
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, VIDEO_PATH);
}在返回中取得选中文件路径
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK)
return;
switch (requestCode) {
case VIDEO_PATH:
Uri uri = data.getData();
String path = getPath( uri);
showToastReal("你选中的视频路径：" + path);
SpUtils.getInstace(this).saveString("videoPath", path);
break;
case PIC_PATH:
Uri picUri = data.getData();
String picPath = getPath(picUri);
showToastReal("你选中的图片路径：" + picPath);
SpUtils.getInstace(this).saveString("picPath", picPath);
break;
}
}public String getPath(Uri uri) {
String path;
if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
path = uri.getPath();
return path;
}
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
path = getPath(this, uri);
} else {//4.4以下下系统调用方法
path = getRealPathFromURI(uri);
}
return path;
}
@SuppressLint("NewApi")
public String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}实现视频轮播
public class VideoActivity extends BaseActivity {
@Bind(R.id.sv_ad)
SurfaceView vv;
@Bind(R.id.id_ig_back)
ImageView idIgBack;
private MediaPlayer mPlayer;
private String path;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_video);
ButterKnife.bind(this);
verifyStoragePermissions(this);
init();
// init2();
}
private void init2() {
String path = SpUtils.getInstace(VideoActivity.this).getString("videoPath");
Uri uri = Uri.parse("file://" + path);
try {
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(getApplicationContext(), uri);
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}
private void init() {
idIgBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
vv.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mPlayer != null) {
mPlayer.stop();
mPlayer.release();
mPlayer = null;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
path = SpUtils.getInstace(VideoActivity.this).getString("videoPath");
try {
if (mPlayer == null) {
mPlayer = MediaPlayer.create(VideoActivity.this, Uri.parse("file://" + path));
}
if(mPlayer==null){
showToastReal("请在个人中心中选择正确的视频");
}
mPlayer.setDisplay(holder);//将SurfaceHolder关联mediaplayer
mPlayer.setLooping(true);
mPlayer.start();
mPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what,
int extra) {
// TODO Auto-generated method stub
return false;
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
}
});
}
public void onBack(View view) {
finish();
}
@Override
public void loadNetData() {
}
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
/**
* 检查应用程序是否允许写入存储设备
* <p>
* <p>
* <p>
* 如果应用程序不允许那么会提示用户授予权限
*
* @param activity
*/
public static void verifyStoragePermissions(Activity activity) {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
}layout的实现
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <SurfaceView android:id="@+id/sv_ad" android:layout_width="match_parent" android:layout_height="match_parent" /> <ImageView android:id="@+id/id_ig_back" android:layout_width="80dp" android:layout_height="80dp" android:layout_marginTop="16dp" android:padding="16dip" android:src="@drawable/icon_back_white" /> </RelativeLayout>
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