[移动开发]android调用摄像头录像的代码（录像并生成mp4文件）

直接给代码吧，首先是MainActivity：

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback{
private TextView btn_stop;
private Button btn;
private int recLen = 11;
private Boolean isRecording = false;
private SurfaceHolder mSurfaceHolder;
private MediaRecorder mediaRecorder;
private Camera mCamera;
private String mVecordFilepath;
Timer timer = new Timer();

final Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg){
        switch (msg.what){
            case 1:
                btn_stop.setText(""+recLen);
                if(recLen<0){
                    timer.cancel();
                    btn_stop.setVisibility(View.GONE);
                }
        }
    }
};
TimerTask task = new TimerTask() {
    @Override
    public void run() {
        recLen--;
        Message message = new Message();
        message.what = 1;
        handler.sendMessage(message);

        //当倒计时时间到1的时候关闭录像
        if (recLen == 1){
            stopRecord();
            stopCamera();
        }
    }
};


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn_stop = findViewById(R.id.luxiangtimer);
    btn = findViewById(R.id.luxiangbtn);
    SurfaceView mSurfaceview = (SurfaceView) findViewById(R.id.surfaceview_luxiang);
    mSurfaceHolder = mSurfaceview.getHolder();
    checkPermission(this);
    initCamera();
}

public void luxiang(View view){
    if (Build.VERSION.SDK_INT >= 23) {
        int REQUEST_CODE_CONTACT = 101;
    }
    btn_stop.setVisibility(View.VISIBLE);
    //这是是判断视频文件有没有创建,如果没有就返回
    boolean creakOk = createRecordDir();
    if (!creakOk) {
        return;
    }

    try {
        mCamera.unlock();
        setConfigRecord();
        mediaRecorder.prepare();
        mediaRecorder.start();

    } catch (Exception e) {
        Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_LONG).show();
    }
    isRecording = true;

    timer.schedule(task,1000,1000);
}

private void setConfigRecord() {
    mediaRecorder = new MediaRecorder();
    mediaRecorder.reset();
    mediaRecorder.setCamera(mCamera);
    mediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() {
        @Override
        public void onError(MediaRecorder mr, int what, int extra) {

        }
    });

    //录像角度
    mediaRecorder.setOrientationHint(90);
    //使用SurfaceView预览
    mediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
    //1.设置采集声音
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    //设置采集图像
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    //2.设置视频，音频的输出格式 mp4
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
    //3.设置音频的编码格式
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    //设置图像的编码格式
    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    CamcorderProfile mProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);

    mediaRecorder.setAudioEncodingBitRate(44100);
    if (mProfile.videoBitRate > 2 * 1024 * 1024) {
        mediaRecorder.setVideoEncodingBitRate(2 * 1024 * 1024);
    } else {
        mediaRecorder.setVideoEncodingBitRate(1024 * 1024);
    }
    mediaRecorder.setVideoFrameRate(mProfile.videoFrameRate);
    mediaRecorder.setVideoSize(1280, 720);

    mediaRecorder.setOutputFile(mVecordFilepath);
}

private void initCamera() {
    mCamera = Camera.open(0);  //①
    mCamera.setDisplayOrientation(90);
    try {
        mCamera.setPreviewDisplay(mSurfaceHolder);

        mCamera.cancelAutoFocus();//此句加上 可自动聚焦 必须加
        Camera.Parameters parameters = mCamera.getParameters();
        //查询摄像头支持的分辨率
        parameters.getSupportedPreviewSizes();
        for (int i = 0; i < parameters.getSupportedPreviewSizes().size(); i++) {
            Log.i("<><><><>Width", parameters.getSupportedPreviewSizes().get(i).width + "");
            Log.i("<><><><>Height", parameters.getSupportedPreviewSizes().get(i).height + "");
        }
        //设置分辨率
        parameters.setPreviewSize(1280, 720);
        //设置聚焦模式
        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
        //缩短Recording启动时间
        parameters.setRecordingHint(true);
        //是否支持影像稳定能力，支持则开启
        if (parameters.isVideoStabilizationSupported())
            parameters.setVideoStabilization(true);
        mCamera.setParameters(parameters);
        mCamera.startPreview();
    } catch (Exception e) {

    }
}

private boolean createRecordDir() {
    if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
        Toast.makeText(this, "SD卡不存在!", Toast.LENGTH_SHORT).show();
        return false;
    }

    mVecordFilepath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/videotest/luxiangtest.mp4";
    File f = new File(mVecordFilepath);
    if(!f.exists()){
        try {
            f.createNewFile();

        }catch (Exception e){

        }
    }
    return true;
}

private void stopRecord() {
    try {
        if (isRecording && mediaRecorder != null) {
            mediaRecorder.setOnErrorListener(null);
            mediaRecorder.setPreviewDisplay(null);
            mediaRecorder.stop();
            mediaRecorder.reset();
            mediaRecorder.release();
            mediaRecorder = null;
            isRecording = false;
        }
    }catch (Exception ex)
    {
        //Toast.makeText(getApplicationContext(),ex.getMessage(),1).show();
    }
}

private void stopCamera() {
    if (mCamera != null) {
        mCamera.setPreviewCallback(null);
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
    }
}

public static void checkPermission(AppCompatActivity activity) {
    if (Build.VERSION.SDK_INT >= 23) {
        int checkPermission =
                ContextCompat.checkSelfPermission(activity, Manifest.permission.RECORD_AUDIO)
                        + ContextCompat.checkSelfPermission(activity, Manifest.permission.READ_PHONE_STATE)
                        + ContextCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                        + ContextCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE);
        if (checkPermission != PackageManager.PERMISSION_GRANTED) {
            //动态申请
            ActivityCompat.requestPermissions(activity, new String[]{
                    Manifest.permission.RECORD_AUDIO,
                    Manifest.permission.READ_PHONE_STATE,
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE}, 123);
            return;
        } else {
            return;
        }
    }
    return;
}

@Override
public void surfaceCreated(@NonNull SurfaceHolder holder) {
    Log.d("111","surfaceCreated");
}

@Override
public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {
    Log.d("111","surfaceChanged");
}

@Override
public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
    Log.d("111","surfaceDestroyed");
}
}

下面是布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<SurfaceView
    android:id="@+id/surfaceview_luxiang"
    android:layout_width="match_parent"
    android:layout_height="400dp" />

<TextView
    android:id="@+id/luxiangtimer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:layout_below="@id/surfaceview_luxiang"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/luxiangbtn"
    android:layout_below="@id/luxiangtimer"
    android:text="录像"
    android:onClick="luxiang"
    tools:ignore="OnClick" />

</RelativeLayout>

下面是版本号：

下面是权限，我这里权限比较多，不光是录像的，不需要的可以删掉：

这样就可以运行啦~