将文件从外部存储加载到 Inputstream [英] Load a file from external storage to Inputstream
本文介绍了将文件从外部存储加载到 Inputstream的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我的外部目录中有一个视频文件.我如何将它加载到 inputstream 变量.目前我正在读取 res/raw 文件夹中的文件,但我想从 sdcard 中读取它.我也不知道文件的名称,但它的路径将通过意图接收.检查以下代码
i have a video file in my external directory. how can i load it to inputstream variable. For the time being i am reading file in the res/raw folder but i want to read it from the sdcard. also i dont know about the name of the file but its path will be recieved through intent. check the following code
public class SonicTest extends Activity
{
VideoView videoView;
String uri;
InputStream soundFile;
File file;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void play(View view)
{
new Thread(new Runnable()
{
public void run()
{
float speed= (float) 1.0;
float pitch= (float) 1.5;
float rate= (float) 1.0;
uri= Environment.getExternalStorageDirectory().toString();
uri=uri+"/video.3gp";
AndroidAudioDevice device = new AndroidAudioDevice(22050, 1);
Sonic sonic = new Sonic(22050, 1);
byte samples[] = new byte[4096];
byte modifiedSamples[] = new byte[2048];
InputStream soundFile = null;
//soundFile = getContentResolver().openInputStream(Uri.parse(uri));
soundFile=getResources().openRawResource(R.raw.video3);
Log.i("testing","check if SoundFile is correct "+soundFile);
int bytesRead;
if(soundFile != null) {
sonic.setSpeed(speed);
sonic.setPitch(pitch);
sonic.setRate(rate);
do {
try {
bytesRead = soundFile.read(samples, 0, samples.length);
} catch (IOException e) {
e.printStackTrace();
return;
}
if(bytesRead > 0) {
sonic.putBytes(samples, bytesRead);
} else {
sonic.flush();
}
int available = sonic.availableBytes();
if(available > 0) {
if(modifiedSamples.length < available) {
modifiedSamples = new byte[available*2];
}
sonic.receiveBytes(modifiedSamples, available);
device.writeSamples(modifiedSamples, available);
}
} while(bytesRead > 0);
device.flush();
}
}
} ).start();
}}
推荐答案
尝试
File file = new File(Uri.toString());
FileInputStream fileInputStream = new FileInputStream(file);
然后你可以从流中读取.
Then you can read from the stream.
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