视频视图未显示录制的视频

Question

当我单击“录制”按钮时，相机开始录制视频。但是当我点击播放按钮时，什么也没发生。我想在VideoView上播放录制的视频。记录按钮工作正常。播放按钮出现问题。录制的视频将保存在内存中。但是不能玩。该如何解决？

清单文件

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.videorecording">

    <uses-permission android:name="android.permission.CAMERA"></uses-permission>

    <uses-feature
        android:name="android.hardware.Camera"
        android:required="true"></uses-feature>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

XML文件

    <Button
        android:id="@+id/recordVideo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="30dp"
        android:layout_marginEnd="323dp"
        android:text="Record"
        android:textSize="15dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/playVideo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="136dp"
        android:paddingLeft="20dp"
        android:text="Play"
        android:textSize="15dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/recordVideo"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

Java文件

 package com.example.videorecording;

import android.content.Intent;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.VideoView;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private Button recordButton, playButton;
    private VideoView videoView;
    static final int REQUEST_VIDEO_CAPTURE = 1;
    MediaController mediaController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recordButton = (Button) findViewById(R.id.recordVideo);
        playButton = (Button) findViewById(R.id.playVideo);



        recordButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recordVideo();
            }
        });


    }


    private void recordVideo() {
        Intent recordVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
        if (recordVideoIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(recordVideoIntent, REQUEST_VIDEO_CAPTURE);

        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable final Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_VIDEO_CAPTURE && requestCode == RESULT_OK) {

            playButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                    VideoView videoView = new VideoView(MainActivity.this);
                    mediaController = new MediaController(MainActivity.this);
                    videoView.setMediaController(mediaController);
                    mediaController.setAnchorView(videoView);
                    videoView.setVideoURI(data.getData());
                    videoView.start();
                    builder.setView(videoView);

                }
            });

        }
    }


}