Android-MediaRecorder录像机(视频)

　　<!-- 刻录是很危险的行为，所以需要权限RECORD_AUDIO，无论是刻录音频还是视频都需要RECORD_AUDIO -->
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    
    <!-- 保存音频文件到sdcard外部存储的权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

　　　　<!--
            MediaRecorder录制视频
            设置横屏显示：     android:screenOrientation="landscape"
            设置无标题+全屏：  android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
        -->
        <activity android:name=".MyMediaRecorderVideoActivity"
                  android:screenOrientation="landscape"
                  android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        </activity>

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

    <SurfaceView
        android:id="@+id/surface_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="刻录视频"
        android:layout_alignParentBottom="true"
        android:onClick="recorderVideo"
        />

</RelativeLayout>

package liudeli.my_media1;

import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

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

public class MyMediaRecorderVideoActivity extends Activity {

    // 定义媒体刻录器 刻录视频+音频
    private MediaRecorder recorder;

    // 定义SurfaceView
    private SurfaceView surfaceView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_media_recorder_video);

        surfaceView = findViewById(R.id.surface_view);

        // 创建媒体刻录器
        recorder = new MediaRecorder();

        // 音频录制的来源：麦克风??
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        // 视频录制的来源：Camera
        recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

        // 文件输出的格式 .3pg
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

        // 音频编码的格式
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        // 视频编码的格式
        recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT); // 使用默认的：手机会自动支持某种格式(H264/H263)

        // 文件输出的路径
        File file = new File(Environment.getExternalStorageDirectory(), "MediaRecorderToVideo.3gp");
        recorder.setOutputFile(file.getAbsolutePath());
    }

    /**
     * 刻录视频
     * @param view
     */
    public void recorderVideo(View view) {

        Button recorderVideo = (Button) view;
        String recorderVideoStr = recorderVideo.getText().toString();

        if ("正在刻录视频".equals(recorderVideoStr)) {
            recorderVideo.setText("刻录视频");

            recorder.stop();
            recorder.reset();   // You can reuse the object by going back to setAudioSource() step
            recorder.release(); // Now the object cannot be reused

        } else if ("刻录视频".equals(recorderVideoStr)) {
            recorderVideo.setText("正在刻录视频");

            /**
             * 在准备之前把SurfaceView 和 MediaRecorder 关联绑定起来
             */
            recorder.setPreviewDisplay(surfaceView.getHolder().getSurface());

            try {
                // 开始准备
                recorder.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }

            // 启动开始刻录
            recorder.start();   // Recording is now started
        }
    }
}