Android-Frame layout, UI layout switching, recording, camera, audio/video player, and audio player

<FrameLayout anroid: layout_weight = "1">

<ImageView android: scaleType = "fitCenter"/>

// No title bar

RequestWindowFeature (Window. FEATURE_NO_TITLE );

 

// Full screen display (hide the status bar)

// Call getWindow (). addFlages (WindowManager. LayoutParams. FLAG_FULLSCREEN) before setContentView );

Androied-programming UI/layout Switching

LinearLayout linearLayout = new LinearLayout (this );

LayoutParams = new LinearLayout. LayoutParams (ViewGroup. LayoutParams. FILL_PARENT, ViewGroup. LayoutParams. FILL_PARENT ){

TextView = new TextView (this );

TextView. setText (R. string. hello );

TextView. setId (34 );

LinearLayout. LayoutParams textParams = new LinearLayout. LayoutParams (

ViewGroup. LayoutParams. FILL_PARENT, ViewGroup. LayoutParams. WRAP_CONTENT );

LinearLayout. addView (textView, textParams );

SetContentView (linearLayout, layoutParams );

}

 

Android-multimedia (recording)

<Uses-permission android: name = "android. permission. RECORD_AUDIO"/>

 

MediaRecorder recorder = new MediaRecorder ();

// Collect sound from the microphone

Recorder. setAudioSource (MediaRecorder. AudioSource. MIC );

// Content output format

Recorder. setOutputFormat (MediaRecorder. OutputFormat. THREE_GPP)

Recorder. setAudioEncoder (MediaRecorder. AudioEncoder. AMR_NB); // Audio Encoding Method

Recorder. setOutputFile ("/mnt/sdcard/itcast. amr ");

Recorder. prepare (); // expected preparation

Recorder. start (); // starts to burn

...

Recorder. stop (); stop burning

Recorder. reset (); // reset

Recorder. release (); // resources must be released after the data is burned.

 

Android-multimedia (audio player)

MediaPlayer mediaPlayer = new MediaPlayer ();

MediaPlayer. setDataSource ("/mnt/sdcard/god.mp3 ");

MediaPlayer. prepare ();

MediaPlayer. start (); // starts or resumes playback.

MediaPlayer. pause (); // pause playback

MediaPlayer. stop (); // stop playing

MediaPlayer. release (); // release resources

// Playback error event

MediaPlayer. setOnErrorListener (new MediaPlayer. OnErrorListener (){

Public Boolean onError (MediaPlayer player, int arg1, int arg2 ){

MediaPlayer. release ();

Return false;

}

});

 

Multimedia (Audio/Video Player)

Add the SurfaceView Control for video screen painting in the main. xml layout file.

<SurfaceView...>

SurfaceView. getHolder (). setFixedSize (176.144); // sets the resolution.

// Set the Surface below not to maintain its own buffer, but to wait for the screen rendering engine content to be pushed to the user

SurfaceView. getHolder (). setType (SurfaceHolder. SURFACE_TYPE_PUSH_BUFFERS );

 

// When a new Activity is opened, SurfaceView is destroyed. When the new Activity is closed, the current Activity returns to the foreground, and SurfaceView is re-created after onResume. Therefore, the callback is complete.

SvVedio. getHolder (). addCallback (new CallbackImpl ())

 

MediaPlayer mediaPlayer = new MediaPlayer ();

MediaPlayer. reset (); // reset to initial state

MediaPlayer. setDisplay (surfaceView. getHolder ());

MediaPlayer. setDataSource ("/mnt/sdcard/oppo.mp4 ");

MediaPlayer. prepare | start (); | pause | stop | release ();

 

Note: If the audio/video playback system has a problem with simulator 2.2, You need to port it to the 2.0 platform.

 

Android-multimedia (CAMERA)

SurfaceView. getHolder (). setFixedSize (176,144); // sets the resolution.

SurfaceView. getHolder (). setType (SurfaceHolder. SURFACE_TYPE_PUSH_BUFFERS );

SurfaceView. getHolder (). addCallback (); // callback

WindowManager wm = getSystemService (Context. WINDOW_SERVICE); // Window Manager

Display display = wm. getDefaultDisplay ();//

Camera camera = Camera. open (); // open the Camera

Camera. Parameters parameters = camera. getParameters ();

Parameters. setPreviewSize (display. getWidth (), display. getHeight (); // size

Parameters. setPreviewFrameRate (3); // 3 frames per second

Parameters. setPictureFormat (PixelFormat. JPEG); // you can specify the photo output format.

Parameters. set ("jpeg-quality", 85); // photo quality

Parameters. setPictureSize (display. getWidth (), display. getHeight ());

Camera. setParameters (parameters );

 

The photo needs to complete the camera settings and start previewing in the surfaceView. holder callback, because it must be available only after the holder is ready, and the truth is the same as that of the player.

StartPreview cannot be called after takePicture because it is asynchronous. You need to start previewing in the picCall callback.

 

Camera

// Display the screenshot through SurfaceView

Camera. setPrevieDisplay (surfaceView. getHolder)

Camera. startPrevice (); // start previewing

Camera. autoFocus (null); // auto focus

Camera. takePicture (null, callback); // take a photo

Camera. stopPrevice (); // stop previewing

Camera. release (); // release the camera.

 

OnKeyDown:

Public Boolean onKeyDown (int keyCode, keyEvent event ){

If (camera! = Null & event. getRepeatCount () = 0 ){

Case KeyEvent. KEYCODE_SEARCH:

}

PictureCallback:

Bitmap bmp = BitmapFactory. decodeByteArray (data, 0, data. length );

File jpg = new File(Environment.getExternalStorageDirectory(),”1.jpg ");

FileOutputStream fos = new FileOutputStream (jpg );

Bmp. compress (Bitmap. CompressFormat. JPEG, 100, fos );

Fos. close ();

Camera. startPreview ();

}

 

Simulate a photo with Intent

If no camera hardware is available, you can use the built-in provider to implement the camera function (this function is not supported by Simulators of 2.2)

Intent intent = new Intent (android. provider. MediaStore. ACTION_IMAGE_CAPTURE );

// Specify the output file

// OutputFileUri specifies the address where the photo is stored. If yes, It stores all-size and large photos; otherwise, a bitmap is returned.

// Receive in the onActivityResult Method

Intent. putExtra (mediaStore. EXTRA_OUTPUT, outputFileUri );

StartActivityForResult (intent, 0 );

 

BitmapFactory. Options options = new BitmapFactory. Options ();

Options. inSampleSize = 1;

Bitmap bitmap = BitmapFactory. decodeFile (_ path, options );

_ Image. setImageBitmap (bitmap );

 

<! -The following permissions are required: ---> www.2cto.com

<Uses-permission android: name = "android. permission. CAMERA"/>

<Uses-feature android: name = "android. hardware. camera"/>

<Uses-feature android: name = "android. hardware. camera. autofocus"/>

Author: to1297488504