照相机和录制

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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！！

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