照相机和录制

梦里梦外; 2023-10-17 10:33 12阅读 0赞

最近研究了下用安卓编写照相机代码和录制的代码，分享给大家

首先是照相机的代码，xml里面的代码

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
        android:layout_width="match_parent" android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:orientation="vertical"
        tools:context="com.liuqian.android_27camera.MainActivity">
    
        <SurfaceView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:id="@+id/main_surface"/>
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="拍照"
            android:onClick="takePhoto"
            />
    
    </LinearLayout>

然后是Java文件的代码

package com.liuqian.android_27camera;
    
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.PixelFormat;
    import android.hardware.Camera;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import android.view.View;
    
    import java.io.FileOutputStream;
    
    public class MainActivity extends AppCompatActivity {
    
        private SurfaceView main_surface;
        private Camera camera;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            main_surface = (SurfaceView) findViewById(R.id.main_surface);
            main_surface.getHolder().addCallback(new SurfaceHolder.Callback() {
    
                @Override
                public void surfaceCreated(SurfaceHolder holder) {
                    //打开照相机
                    camera = Camera.open();
                    //参数
                    Camera.Parameters parameters= camera.getParameters();
                    //设置照片的输出格式
                    parameters.setPictureFormat(PixelFormat.JPEG);
                    //设置照片的质量
                    parameters.set("jpeg-quality",85);
                    //设置参数
                    camera.setParameters(parameters);
                    //将画面展现到SurfaceView
                    try{
                        camera.setPreviewDisplay(main_surface.getHolder());
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                    //开启预览模式
                    camera.startPreview();
                }
    
                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    
                }
    
                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
                    //当预览界面关闭时，销毁照相机
                    camera.startPreview();
                    camera.release();
                    camera=null;
                }
            });
        }
    
        public void takePhoto(View view){
            camera.takePicture(null, null, new Camera.PictureCallback() {
                @Override
                public void onPictureTaken(byte[] data, Camera camera) {
                    //图片压缩技术
                    Bitmap bitmap= BitmapFactory.decodeByteArray(data,0,data.length);
                    try{
                        FileOutputStream fos=new FileOutputStream("/mnt/sdcard/G150820"+System.currentTimeMillis()+".png");
                        bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);
                        camera.stopPreview();
                        camera.startPreview();
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                }
            });
        }
    
    }

接下来的话是录制的代码，而首先的xml里面的代码

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_media_record"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.liuqian.android_27camera.MediaRecordActivity">
    
        <SurfaceView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/recorder_surface"
            />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >
    
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="开始"
                android:onClick="start"
                />
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="停止"
                android:onClick="stop"
                />
        </LinearLayout>
    
    </RelativeLayout>

接着的是录制Java文件的代码

package com.liuqian.android_27camera;
    
    import android.media.MediaRecorder;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.SurfaceView;
    import android.view.View;
    
    import java.io.IOException;
    
    public class MediaRecordActivity extends AppCompatActivity {
    
        private SurfaceView recorder_surface;
        private MediaRecorder mediaRecorder;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_media_record);
            //得到SurfaceView
            recorder_surface = (SurfaceView) findViewById(R.id.recorder_surface);
            //实例化媒体录制器
            mediaRecorder = new MediaRecorder();
        }
    
        public void start(View view){
            //重置媒体录制器
            mediaRecorder.reset();
            //从照相机采集视频
            mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
            mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            //设置格式
            mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            //设置编码方式
            mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
            mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            //设置保存路径
            mediaRecorder.setOutputFile("/mnt/sdcard/G150820"+System.currentTimeMillis()+".mp4");
            //设置预览
            mediaRecorder.setPreviewDisplay(recorder_surface.getHolder().getSurface());
            try {
                mediaRecorder.prepare();
                mediaRecorder.start();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
        public void stop(View view){
            if(mediaRecorder!=null){
                mediaRecorder.stop();
                mediaRecorder.release();;
                mediaRecorder=null;
            }
        }
    
    }

分享也就到此结束了，如有失误，请指正，本人虚心接受，谢谢！！