Camera api1录像的实现

接下来是最后一个功能的实现录像，倒腾了几个小时也算做出来了，中途也遇到各式各样的错误，大多是因为方法调用顺序不正确 。废话不多说下面回到正题。
惯例post参考的文章：[https://www.cnblogs.com/guanxinjing/p/10986766.html] (https://www.cnblogs.com/guanxinjing/p/10986766.html)

在manifests中的xml加入录像的许可

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

在主类中定义 private MediaRecorder mrecord;//用于启动、设置录像功能
private boolean isrecord=false;//判断录像功能是否已经启动
private SurfaceHolder mSurfaceHolder;

在oncreate方法中找到button
final Button recording=findViewById(R.id.recording);
然后给recording设定监听器和点击方法recording.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {}});
定义一个初始化record的方法

 private void initrecord(){
        mrecord=new MediaRecorder();
    }

定义一个设置record值的方法configurerecord()

private void configurerecord(){
        File save=new File(getExternalCacheDir(),"recording.mp4");
        if(save.exists()){
            save.delete();
        }
        camera.unlock();
        mrecord.setCamera(camera);
        mrecord.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mrecord.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        mrecord.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
        mrecord.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        mrecord.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
        mrecord.setVideoFrameRate(60);
        mrecord.setMaxDuration(60*100);
        mrecord.setPreviewDisplay(mSurfaceHolder.getSurface());
        mrecord.setOutputFile(save.getAbsolutePath());
        mrecord.setOnErrorListener(new MediaRecorder.OnErrorListener() {
            @Override
            public void onError(MediaRecorder mr, int what, int extra) {
                mrecord.stop();
                mrecord.reset();
                try{
                    camera.setPreviewDisplay(v.getHolder());
                    camera.startPreview();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }

因为推荐的文章里有详细介绍我就不解释上述set的作用了
设置好值后就是开启录像和关闭录像了

    private void startRecorder(){
        if(!isrecord){
            camera.stopPreview();;
            configurerecord();
            try {
                mrecord.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }
            mrecord.start();
            isrecord=true;
        }
    }

    private void stopRecorder(){
        if(isrecord){
            mrecord.stop();
            mrecord.reset();
            isrecord=false;
            try{
                camera.setPreviewDisplay(v.getHolder());
                camera.startPreview();

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

这全部设置好后回到关于recording的onclick方法中补充相关的方法

   recording.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Button b=(Button)v;

               switch (b.getText().toString()){//这里switch的值是按钮的文本值，这个可以自己设置不一定要和我一样
                   case "recording":
                       startRecorder();
                       b.setText("stop");
                       break;
                   case  "stop":
                       stopRecorder();
                       b.setText("recording");
                       break;
               }
            }
        });

这样一个简单的录像、预览、拍照就算完成了。除了图片的保存。
用手机录像完后，在手机文件管理器中搜索就找到了录制的视频了
下面post出完整的代码
MainActivity.java

package com.example.testdemo2;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;

import android.media.MediaRecorder;
import android.os.Bundle;

import android.hardware.Camera;

import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

import java.io.File;
import java.io.IOException;

public class MainActivity extends AppCompatActivity implements Shutter {

    private Camera camera;
    private MediaRecorder mrecord;
    private boolean isrecord=false;
    private Camera.Size resize;
    private  SurfaceView v;
    private SurfaceHolder mSurfaceHolder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        v=findViewById(R.id.surfaceView);
        final Button take_picture=findViewById(R.id.snapshot);
        final Button recording=findViewById(R.id.recording);
        SurfaceHolder h=v.getHolder();
        initrecord();
        take_picture.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                camera.takePicture(shutterCallback,null,pictureCallback);

            }
        });

        recording.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Button b=(Button)v;

               switch (b.getText().toString()){
                   case "recording":
                       startRecorder();
                       b.setText("stop");
                       break;
                   case  "stop":
                       stopRecorder();
                       b.setText("recording");
                       break;
               }
            }
        });

            startpreview(h);

    }
    public void startpreview(SurfaceHolder h){
        if(ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED) {
            h.addCallback(new SurfaceHolder.Callback() {

                @Override
                public void surfaceCreated(SurfaceHolder h) {

                    camera = camera.open();
                    camera.setDisplayOrientation(90);
                    try {
                        camera.setPreviewDisplay(h);
                        camera.startPreview();

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                    mSurfaceHolder = holder;
                }

                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
                    camera.release();
                }
            });
        }
    }
    Camera.ShutterCallback shutterCallback=new Camera.ShutterCallback() {
        @Override
        public void onShutter() {

        }
    };
    Camera.PictureCallback pictureCallback=new Camera.PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {

        }
    };


    private void initrecord(){
        mrecord=new MediaRecorder();
    }

    private void configurerecord(){
        File save=new File(getExternalCacheDir(),"recording.mp4");
        if(save.exists()){
            save.delete();
        }
        camera.unlock();
        mrecord.setCamera(camera);
        mrecord.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mrecord.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        mrecord.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
        mrecord.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        mrecord.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
        //mrecord.setVideoSize();
        mrecord.setVideoFrameRate(60);
        //mrecord.setOrientationHint();
        mrecord.setMaxDuration(60*100);
       // Surface surface=new Surface(v.getHolder());
        mrecord.setPreviewDisplay(mSurfaceHolder.getSurface());
        mrecord.setOutputFile(save.getAbsolutePath());
        mrecord.setOnErrorListener(new MediaRecorder.OnErrorListener() {
            @Override
            public void onError(MediaRecorder mr, int what, int extra) {
                mrecord.stop();
                mrecord.reset();
                try{
                    camera.setPreviewDisplay(v.getHolder());
                    camera.startPreview();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
    private void startRecorder(){
        if(!isrecord){
            camera.stopPreview();;
            configurerecord();
            try {
                mrecord.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }
            mrecord.start();
            isrecord=true;
        }
    }

    private void stopRecorder(){
        if(isrecord){
            mrecord.stop();
            mrecord.reset();
            isrecord=false;
            try{
                camera.setPreviewDisplay(v.getHolder());
                camera.startPreview();

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testdemo2">

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

    <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>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">


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

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="600dp"
        android:layout_height="480dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/snapshot"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="109dp"
        android:layout_marginRight="109dp"
        android:text="snapshot"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/recording"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/recording" />

    <Button
        android:id="@+id/recording"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="recording"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/snapshot"
        app:layout_constraintTop_toBottomOf="@+id/surfaceView" />

</androidx.constraintlayout.widget.ConstraintLayout>

这里就是全部的代码了，因为这是camera api1的所以就不大算继续深入学习了，准备开始camera api2的学习，下次就更新camera api2的拍摄、预览、录像，希望这篇文章对也是新手的你有所帮助！

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