将文件从外部存储加载到 Inputstream [英] Load a file from external storage to Inputstream

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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.

这篇关于将文件从外部存储加载到 Inputstream的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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