Android实现拍照功能

2023-09-12 04:18:06 68

大家好，这是一个简单的拍照功能，很简单的界面，一个显示图像区域SurfaceView一个“拍照”按钮。直接上代码！

1、CameraDemoActivity.java（主界面）

packageorg.winplus.camera;

importjava.io.File;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.util.Date;

importandroid.app.Activity;
importandroid.content.pm.ActivityInfo;
importandroid.graphics.PixelFormat;
importandroid.hardware.Camera;
importandroid.os.AsyncTask;
importandroid.os.Bundle;
importandroid.os.Environment;
importandroid.text.format.DateFormat;
importandroid.util.Log;
importandroid.view.KeyEvent;
importandroid.view.SurfaceHolder;
importandroid.view.SurfaceView;
importandroid.view.View;
importandroid.view.Window;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;

publicclassCameraDemoActivityextendsActivity{

privatefinalstaticStringTAG="CameraActivity";
privateSurfaceViewsurfaceView;
privateSurfaceHoldersurfaceHolder;
privateCameracamera;
privateFilepicture;
privateButtonbtnSave;

@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
setupViews();
}

privatevoidsetupViews(){
surfaceView=(SurfaceView)findViewById(R.id.camera_preview);//Camerainterfacetoinstantiatecomponents
surfaceHolder=surfaceView.getHolder();//Camerainterfacetoinstantiatecomponents
surfaceHolder.addCallback(surfaceCallback);//AddacallbackfortheSurfaceHolder
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

btnSave=(Button)findViewById(R.id.save_pic);

btnSave.setOnClickListener(newOnClickListener(){

@Override
publicvoidonClick(Viewv){
takePic();
}
});
}


@Override
publicbooleanonKeyDown(intkeyCode,KeyEventevent){
if(keyCode==KeyEvent.KEYCODE_CAMERA
||keyCode==KeyEvent.KEYCODE_SEARCH){
takePic();
returntrue;
}
returnsuper.onKeyDown(keyCode,event);
}

privatevoidtakePic(){

camera.stopPreview();//stopthepreview

camera.takePicture(null,null,pictureCallback);//picture
}

//Photocallback
Camera.PictureCallbackpictureCallback=newCamera.PictureCallback(){
//@Override
publicvoidonPictureTaken(byte[]data,Cameracamera){
newSavePictureTask().execute(data);
camera.startPreview();
}
};

//savepic
classSavePictureTaskextendsAsyncTask{
@Override
protectedStringdoInBackground(byte[]...params){
Stringfname=DateFormat.format("yyyyMMddhhmmss",newDate()).toString()+".jpg";

Log.i(TAG,"fname="+fname+";dir="+Environment.getExternalStorageDirectory());
//picture=newFile(Environment.getExternalStorageDirectory(),fname);//createfile

picture=newFile(Environment.getExternalStorageDirectory()+"/"+fname);

try{
FileOutputStreamfos=newFileOutputStream(picture.getPath());//Getfileoutputstream
fos.write(params[0]);//Writtentothefile
fos.close();
}catch(Exceptione){
e.printStackTrace();
}
returnnull;
}
}

//SurfaceHodlerCallbackhandletoopenthecamera,offcameraandphotosizechanges
SurfaceHolder.CallbacksurfaceCallback=newSurfaceHolder.Callback(){

publicvoidsurfaceCreated(SurfaceHolderholder){
Log.i(TAG,"surfaceCallback====");
camera=Camera.open();//Turnonthecamera
try{
camera.setPreviewDisplay(holder);//SetPreview
}catch(IOExceptione){
camera.release();//releasecamera
camera=null;
}
}

publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,
intheight){
Log.i(TAG,"====surfaceChanged");
Camera.Parametersparameters=camera.getParameters();//Cameraparameterstoobtain
parameters.setPictureFormat(PixelFormat.JPEG);//SettingPictureFormat
//parameters.set("rotation",180);//Arbitraryrotation
camera.setDisplayOrientation(0);
//parameters.setPreviewSize(400,300);//SetPhotoSize
camera.setParameters(parameters);//Settingcameraparameters
camera.startPreview();//StartPreview
}

publicvoidsurfaceDestroyed(SurfaceHolderholder){
Log.i(TAG,"====surfaceDestroyed");
camera.stopPreview();//stoppreview
camera.release();//Releasecameraresources
camera=null;
}
};
}

2、main.xml（布局文件）

3、别忘了添加权限：

源码下载：Android实现拍照功能

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Android实现拍照功能

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