文章标题android自制多媒体视频播放器和图片压缩技术(字节数组转成Bitmap)

1.在androidmanifest.xml配置

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

在xml中通过SurfaceView来显示

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

Java代码的照相机实现过程，通过 Camera的一些参数，将取到的数值放画面展示到SurfaceView

 sv_main_surface = (SurfaceView) findViewById(R.id.sv_main_surface);        sv_main_surface.getHolder().addCallback(new SurfaceHolder.Callback() {            @Override            public void surfaceCreated(SurfaceHolder holder) {                //打开照相机                camera = Camera.open();                //设置参数                Camera.Parameters parameters=camera.getParameters();                parameters.setPictureFormat(PixelFormat.JPEG);                parameters.set("jpeg-quality",85);                camera.setParameters(parameters);                //将画面展示到SurfaceView                try {                    camera.setPreviewDisplay(sv_main_surface.getHolder());                    //开启预览                    camera.startPreview();                } catch (IOException e) {                    e.printStackTrace();                }            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {            }            @Override            public void surfaceDestroyed(SurfaceHolder holder) {                //关闭照相机                if(camera!=null){                    camera.release();                    camera.stopPreview();                    camera=null;                }            }        });

//将图片大小进行压缩,图片压缩技术(字节数组转成Bitmap),
//通过文件输出流FileOutputStream的形式将图片进行压缩

 public void takePhoto(View view) {        camera.takePicture(null, null, new Camera.PictureCallback() {            @Override            public void onPictureTaken(byte[] bytes, Camera camera) {                //实例化文件输出流                //写                //压缩（图片）                //将字节数组转成Bitmap                Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length);                try {                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/dcim/相机/G150831_"+System.currentTimeMillis()+".png");                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);                    //重新继续拍照                    camera.stopPreview();                    camera.startPreview();                } catch (FileNotFoundException e) {                    e.printStackTrace();                }            }        });    }

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