录像

https://www.cnblogs.com/zhujiabin/p/9035883.html

音视频同步原理讲的清楚: https://blog.csdn.net/zhuweigangzwg/article/details/25815851

package com.example.recordvideo;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.graphics.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.File;
import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;

public class MainActivity extends Activity implements OnClickListener {

    private static final String TAG = "MainActivity";
    // 程序中的两个按钮
    Button record, stop;
    // 系统的视频文件
    File videoFile;
    MediaRecorder mRecorder;
    // 显示视频预览的SurfaceView
    SurfaceView sView;
    // 记录是否正在进行录制
    private boolean isRecording = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 获取程序界面中的两个按钮
        record = (Button) findViewById(R.id.record);
        stop = (Button) findViewById(R.id.stop);
        // 让stop按钮不可用
        stop.setEnabled(false);
        // 为两个按钮的单击事件绑定监听器
        record.setOnClickListener(this);
        stop.setOnClickListener(this);
        // 获取程序界面中的SurfaceView
        sView = (SurfaceView) this.findViewById(R.id.sView);
        // 设置分辨率
        //sView.getHolder().setFixedSize(1920, 1080);   // 1080P
        // 设置该组件让屏幕不会自动关闭
        //sView.getHolder().setKeepScreenOn(true);
        verifyStoragePermissions(this);

    }

    @Override
    public void onClick(View v) {
        // 单击录制按钮
        if (v.getId() == R.id.record) {
            if (!Environment.getExternalStorageState().equals(
                    android.os.Environment.MEDIA_MOUNTED)) {
                Toast.makeText(MainActivity.this, "SD卡不存在，请插入SD卡！", Toast.LENGTH_SHORT).show();
                return;
            }
            try {
                // 创建保存录制视频的视频文件
                //videoFile = new File(Environment.getExternalStorageDirectory()
                 //       .getCanonicalFile() + "/my_video.mp4");
                videoFile = new File(getExternalFilesDir(""),"0919.mp4");

               // videoFile = new File("data/data/com.example.recordvideo/0919.mp4");
                // 创建MediaPlayer对象
                mRecorder = new MediaRecorder();
                mRecorder.reset();
                //


                //

                // 设置从麦克风采集声音
                mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                // 设置从摄像头采集图像
                mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

                // 设置视频文件的输出格式
                // 必须在设置声音编码格式、图像编码格式之前设置
                mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
                // 设置声音编码的格式
                //mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
                mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
                       // .AudioEncoder.DEFAULT);
                // 设置图像编码的格式
                //mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
                mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
                mRecorder.setOrientationHint(90);
                //mRecorder.setVideoSize(1920, 1080);  // 1080P
                mRecorder.setVideoSize(640, 480);  // 1080P
                // 每秒16帧 已加入帧数就出错
               // mRecorder.setVideoFrameRate(20);
                mRecorder.setMaxDuration(10*1000);
                //mRecorder.setVideoFrameRate(30);
                //mRecorder.setVideoEncodingBitRate(1024*1024*20);
                mRecorder.setOutputFile(videoFile.getAbsolutePath());
                Log.i(TAG, "---------------->: "+videoFile.getAbsolutePath());
                // 指定使用SurfaceView来预览视频
                mRecorder.setPreviewDisplay(sView.getHolder().getSurface());  // ①
                mRecorder.prepare();
                // 开始录制
                mRecorder.start();
                Log.d(TAG, "---recording---");
                // 让record按钮不可用
                record.setEnabled(false);
                // 让stop按钮可用
                stop.setEnabled(true);
                isRecording = true;
                /*
                try{
                    //--
                    FileOutputStream txtFile = new FileOutputStream("data/data/com.example.recordvideo/0919.txt");
                    Log.d(TAG, "---recording---"+txtFile);
                    txtFile.write("haha".getBytes());
                    txtFile.flush();
                    txtFile.close();
                } catch (Exception e){
                    e.printStackTrace();
                }
                */
                //

            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (v.getId() == R.id.stop) {   // 单击停止按钮
            // 如果正在进行录制
            if (isRecording) {
                // 停止录制
                mRecorder.stop();
                mRecorder.reset();
                // 释放资源
                mRecorder.release();
                Log.i(TAG, "---------------->:stop" );
                mRecorder = null;
                // 让record按钮可用
                record.setEnabled(true);
                // 让stop按钮不可用
                stop.setEnabled(false);
            }
        }
    }



    private  final int REQUEST_EXTERNAL_STORAGE = 1;
    private  String[] PERMISSIONS_STORAGE = {
            Manifest.permission.CAMERA,
            Manifest.permission.RECORD_AUDIO,
            Manifest.permission.WRITE_EXTERNAL_STORAGE };
    public  void verifyStoragePermissions(Activity activity) {
        // Check if we have write permission
      //  int permission = ActivityCompat.checkSelfPermission(activity,
        //        Manifest.permission.WRITE_EXTERNAL_STORAGE);
        //if (permission != PackageManager.PERMISSION_GRANTED)
        {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,
                    REQUEST_EXTERNAL_STORAGE);
        }
    }

}

    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus"/>
    <uses-permission android:name="android.permission.CAMERA" >
    </uses-permission>
    <uses-permission android:name="android.permission.RECORD_AUDIO" >
    </uses-permission>

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