【移動應用開發技術】Android如何選擇圖片或視頻進行循環播放

private

void

setVideoPath()

{

Intent

intent

=

new

Intent(Intent.ACTION_GET_CONTENT);

intent.setType("*/*");//設置類型，我這里是任意類型，任意后綴的可以這樣寫。

intent.addCategory(Intent.CATEGORY_OPENABLE);

startActivityForResult(intent,

VIDEO_PATH);

}@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("你選中的視頻路徑："

+

path);

SpUtils.getInstace(this).saveString("videoPath",

path);

break;

case

PIC_PATH:

Uri

picUri

=

data.getData();

String

picPath

=

getPath(picUri);

showToastReal("你選中的圖片路徑："

+

picPath);

SpUtils.getInstace(this).saveString("picPath",

picPath);

break;

}

}public

String

getPath(Uri

uri)

{

String

path;

if

("file".equalsIgnoreCase(uri.getScheme()))

{//使用第三方應用打開

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以下下系統調用方法

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

"viders.downloads.documents".equals(uri.getAuthority());

}

/**

*

@param

uri

The

Uri

to

check.

*

@return

Whether

the

Uri

authority

is

MediaProvider.

*/

public

boolean

isMediaDocument(Uri

uri)

{

return

"viders.media.documents".equals(uri.getAuthority());

}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("請在個人中心中選擇正確的視頻");

}

mPlayer.setDisplay(holder);//將SurfaceHolder關聯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

};

/**

*

檢查應用程序是否允許寫入存儲設備

*

<p>

*

<p>

*

<p>

*

如果應用程序不允許那么會提示用戶授予權限

*

*

@param

activity

*/

public

static

void

verifyStoragePermissions(Activity

activity)

{

//

Check

if

we

have

wr