48. Android 多媒体技术——MediaRecorder录制视频

48. Android 多媒体技术——MediaRecorder录制视频
48.1 MediaRecorder录制视频
使用MediaRecorder能够编写从设备麦克风与相机捕获音视频、保存音频并使用MediaRecorder进行播放的应用。

添加权限

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

Android6.0以上还需要进行动态申请。

ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA,Manifest.permission.RECORD_AUD

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="录制视频"
android:onClick="record"
/>

</LinearLayout>

新建跳转Activity

MediaRecordActivity.java

package com.dingjiaxiong.mymediarecorder;

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

import android.hardware.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.widget.Button;

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

public class MediaRecordActivity extends AppCompatActivity implements View.OnClickListener {
private TextureView textureView;
private Button btn_opt;
private MediaRecorder mediaRecorder;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_media_record);
textureView = findViewById(R.id.textureView);
btn_opt = findViewById(R.id.btn_opt);

btn_opt.setOnClickListener(this);
}

@Override
public void onClick(View v) {
CharSequence text = btn_opt.getText();
if (TextUtils.equals(text, "开始")) {
btn_opt.setText("结束");
mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //设置音频源麦克风
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);//设备视频源摄像头
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);//指定视频文件格式
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
//设置视频输出文件
mediaRecorder.setOutputFile(new File(getExternalFilesDir(""), "a.mp4").getAbsolutePath());
mediaRecorder.setVideoSize(640, 480);
mediaRecorder.setPreviewDisplay(new Surface(textureView.getSurfaceTexture()));
try {
mediaRecorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mediaRecorder.start();
} else {
btn_opt.setText("开始");
mediaRecorder.stop();
mediaRecorder.release();
}