ym——Android从零开始(26)(设置全屏+横屏、相机拍照、视频录制)(新)

转载请注明本文出自Cym的博客（http://blog.csdn.net/cym492224103），谢谢支持！

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