Android从零开始(26)(设置全屏+横屏、相机拍照、视频录制)(新)

相机拍照、视频录制相机拍照

全屏显示有两种方式：

在androidManifest.xml里面的application标签下设置

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"全屏显示

Java代码

//指定Activity没有标题（一定要在setContentView之前调用）
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
//全屏显示
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                 WindowManager.LayoutParams.FLAG_FULLSCREEN);

设置横屏

在androidManifest.xml里面的activity标签下设置

android:screenOrientation="landscape"横屏显示

相机代码

       /** surfaceview的创建是在Activity完全显示之后，才创建
        * 只能使用回调监听
        * */

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       //指定Activity没有标题（一定要在setContentView之前调用）
       requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.main);
       //全屏显示
       getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);


       surfaceview = (SurfaceView) findViewById(R.id.surfaceview);
              // 通过holder来设置surfaceview的参数
       SurfaceHolder holder = surfaceview.getHolder();
              // 设置显示固定大小
       holder.setFixedSize(176, 144);
              // 不要让SurfaceView 缓存数据，直接输出
       holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

       //保持屏幕的高亮
       surfaceview.setKeepScreenOn(true);

       //添加Surfaceview的创建监听
       holder.addCallback(new MyCallback());



    }


   private class MyCallback implements Callback{
              @Override
              public void surfaceCreated(SurfaceHolderholder) {
                     //TODO Auto-generated method stub
                     try{
                            //得到相机对象
                            camera = Camera.open();
                            //相机的参数
                            Parameters parameters =camera.getParameters();
                            Log.i("i",parameters.flatten());

                            //设置预览显示
                            camera.setPreviewDisplay(holder);
                            //开始预览
                            camera.startPreview();
                     }catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                     }
              }
              @Override
              public void surfaceChanged(SurfaceHolderholder, int format, int width,
                            int height) {
                     //TODO Auto-generated method stub

              }
              @Override
              public voidsurfaceDestroyed(SurfaceHolder holder) {
                     //TODO Auto-generated method stub
                     if(camera!= null){
                camera.release();
                camera= null;
                  }
              }

    }

   //对焦都是由硬件直接完成
   public void foucs(View v){
           camera.autoFocus(null);
    }


   public void take(View v){
           /**
            *shutter,快门
            *raw, 相机捕获的原始数据
            *jpeg 相机处理后的数据
            */
           camera.takePicture(null, null, newMyPictureCallback());
    }

   private class MyPictureCallback implements PictureCallback{
              @Override
              public void onPictureTaken(byte[] data,Camera camera) {
                     //TODO Auto-generated method stub
                     try{
                            File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");
                            FileOutputStream fos = newFileOutputStream(file);
                            fos.write(data);
                            fos.close();

                            //处理照片的时候，相机被占用了。要想重新预览，就开始预览
                            camera.startPreview();

                     }catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                     }

              }

    }

   @Override
   protected void onDestroy() {
           // TODO Auto-generated method stub
           super.onDestroy();

    }

}

所需权限：   

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

视频录制

public class MainActivity extends Activity{
   private SurfaceView surfaceview;
       privateMediaRecorder mr;
       privateButton bt_start;
       privateButton bt_stop;
       /**Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);

       surfaceview = (SurfaceView) findViewById(R.id.surfaceview);

       bt_start = (Button) findViewById(R.id.bt_start);
       bt_stop = (Button) findViewById(R.id.bt_stop);

       SurfaceHolder holder = surfaceview.getHolder();
       holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
       holder.setFixedSize(176, 144);

       surfaceview.setKeepScreenOn(true);

    }

   public void start(View v){
           try {
                     mr = new MediaRecorder();
                     mr.reset();

                     mr.setAudioSource(AudioSource.MIC);
                     mr.setVideoSource(VideoSource.CAMERA);

                     mr.setOutputFormat(OutputFormat.THREE_GPP);

                     mr.setAudioEncoder(AudioEncoder.AMR_NB);
                     mr.setVideoEncoder(VideoEncoder.H264);

                     Filefile = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".3gp");
                     mr.setOutputFile(file.getAbsolutePath());

                     //设置预览显示
                     mr.setPreviewDisplay(surfaceview.getHolder().getSurface());


                     mr.prepare();
                     mr.start();

                     bt_start.setEnabled(false);
                     bt_stop.setEnabled(true);
              } catch (Exception e) {
                     //TODO Auto-generated catch block
                     e.printStackTrace();
              }
    }
   public void stop(View v){
           mr.stop();
           bt_start.setEnabled(true);
              bt_stop.setEnabled(false);
    }

   @Override
    protected voidonDestroy() {
           //TODO Auto-generated method stub
           super.onDestroy();

           if(mr!= null){
                  mr.release();
                  mr = null;
           }
    }
}

所需权限：

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

课后问题

怎么设置全屏显示

全屏显示有两种方式：

在androidManifest.xml里面的application标签下设置

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"全屏显示

Java代码

//指定Activity没有标题（一定要在setContentView之前调用）

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);

//全屏显示

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                 WindowManager.LayoutParams.FLAG_FULLSCREEN);

怎么设置横屏显示

设置横屏

在androidManifest.xml里面的activity标签下设置

android:screenOrientation="landscape"横屏显示

Camer在使用的是是否需要权限

需要

使用哪个类可以完成视频的刻录

MediaRecorder