Android 选择图片或视频 ，循环播放

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>