Android选择视频并播放

package com.example.myapplication;

import java.lang.System;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.media.MediaPlayer;
import android.os.Environment;
import android.graphics.BitmapFactory;
import  android.util.Log;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;

import android.database.Cursor;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.calib3d.Calib3d;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.core.Size;
import org.opencv.imgproc.Imgproc;

import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Intent;

import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.Toast;
import android.widget.VideoView;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.imgproc.Imgproc;
import java.io.InputStream;





public class MainActivity extends AppCompatActivity
{
    private double max_size = 1024;
    private int PICK_IMAGE_REQUEST = 1;
    private VideoView video;
    private Bitmap selectbp;
    private Bitmap selectbptmp;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        staticLoadCVLibraries();

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        video = (VideoView)findViewById(R.id.video);

        Button selectImageBtn = (Button)findViewById(R.id.select_btn);
        selectImageBtn.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v) {selectImage(); }
        });
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        if (requestCode == 1)
        {
            if (resultCode == RESULT_OK)
            {
                Uri uri = data.getData();
                video.setVideoURI(uri);
            }
        }

        MediaController mc = new MediaController(MainActivity.this);
        video.setMediaController(mc);
        video.requestFocus();

        try{
            video.start();
        }catch(Exception e){
            e.printStackTrace();
        }

        video.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
            @Override
            public void onCompletion(MediaPlayer mp)
            {
                Toast.makeText(MainActivity.this, "视频播放完毕", Toast.LENGTH_SHORT).show();
            }
        });

        super.onActivityResult(requestCode, resultCode, data);
    }






    private void selectImage()
    {
        Intent intent = new Intent();
        intent.setType("video/*;image/*");//同时选择视频和图片
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent,"选择图像..."), PICK_IMAGE_REQUEST);
    }



    private void staticLoadCVLibraries()
    {
        boolean load = OpenCVLoader.initDebug();
        if(load)
        {
            Log.i("CV", "Open CV Libraries loaded...");
        }
    }

//    @Override
//    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//        super.onActivityResult(requestCode, resultCode, data);
//        if(requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
//            Uri uri = data.getData();
//            try {
//                Log.d("image-tag", "start to decode selected image now...");
//                InputStream input = getContentResolver().openInputStream(uri);
//                BitmapFactory.Options options = new BitmapFactory.Options();
//                options.inJustDecodeBounds = true;
//                BitmapFactory.decodeStream(input, null, options);
//                int raw_width = options.outWidth;
//                int raw_height = options.outHeight;
//                int max = Math.max(raw_width, raw_height);
//                int newWidth = raw_width;
//                int newHeight = raw_height;
//                int inSampleSize = 1;
//                if(max > max_size) {
//                    newWidth = raw_width / 2;
//                    newHeight = raw_height / 2;
//                    while((newWidth/inSampleSize) > max_size || (newHeight/inSampleSize) > max_size) {
//                        inSampleSize *=2;
//                    }
//                }
//
//                options.inSampleSize = inSampleSize;
//                options.inJustDecodeBounds = false;
//                options.inPreferredConfig = Bitmap.Config.ARGB_8888;
//                selectbp    = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
//                selectbptmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
//                myImageView.setImageBitmap(selectbptmp);
//
//            } catch (Exception e)
//            {
//                e.printStackTrace();
//            }
//        }
//    }



//    private void kaySrc()
//    {
//        Mat src = new Mat();
//        Mat temp = new Mat();
//        Mat dst = new Mat();
//
//        if(selectbp != null)
//        {
//            Utils.bitmapToMat(selectbp, src);
//            Imgproc.cvtColor(src, temp, Imgproc.COLOR_BGRA2BGR);
//            Log.i("CV", "image type:" + (temp.type() == CvType.CV_8UC3));
//            Imgproc.cvtColor(temp, dst, Imgproc.COLOR_BGR2GRAY);
//            Utils.matToBitmap(dst, selectbptmp);
//            myImageView.setImageBitmap(selectbptmp);
//        }
//        else
//        {
//            new AlertDialog.Builder(MainActivity.this)
//                    .setMessage("请先选择图片！")
//                    .setPositiveButton("OK",
//                            new DialogInterface.OnClickListener() {
//                                @Override
//                                public void onClick(DialogInterface dialog, int which) {}
//                            }).show();
//        }
//    }

}