The realization of the camera function of Android phone

First, layout file Main.xml

<?xml version= "1.0" encoding= "Utf-8"?><framelayout xmlns:android="Http://schemas.android.com/apk/res/android"  Android:layout_width="Fill_parent"android:layout_height="Fill_parent" >            <surfaceviewandroid:id="@+id/surfaceview"android:layout_width ="Fill_parent"android:layout_height="fill_parent" />                            <relativelayout  android: ID  = "@+id/buttonlayout"  android:layout_width  = "fill_parent"  android:layout_height  = "fill_parent"  android:visibility  = "Gone" ;         <button  android:id= "@+id/takepicture"  android:layout_width  =< Span class= "Hljs-value" > "wrap_content"  android:layout_height  = "wrap_content"  android:layout_alignparentbottom  = "true"  android:layout_alignparentright  = "true"  android:layout_marginright  =" 5DP " android:onclick  =" Takepictur E " android:text  =" @string/takepicture "/>         <button  android:id= "@+id/autofocus"  android:layout_width  =
     
       "wrap_content" 
      android:layout_height  = "wrap_content"  android:layout_aligntop  =" @id/takepicture " android:layout_marginright  = "20DP"  android:layout_toleftof  =" @id/takepicture " android:onclick  =" Takepi Cture " android:text  =" @string/autofocus "/>     </relativelayout></framelayout>

Second, Mainactivity.java

ImportJava.io.File;ImportJava.io.FileOutputStream;Importandroid.app.Activity;ImportAndroid.hardware.Camera;ImportAndroid.hardware.Camera.PictureCallback;ImportAndroid.os.Bundle;ImportAndroid.os.Environment;ImportAndroid.view.MotionEvent;ImportAndroid.view.SurfaceHolder;ImportAndroid.view.SurfaceHolder.Callback;ImportAndroid.view.SurfaceView;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.view.Window;ImportAndroid.view.WindowManager; Public  class mainactivity extends Activity {    PrivateView layout;PrivateCamera camera;@Override     Public void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Requestwindowfeature (Window.feature_no_title); GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN        );        Setcontentview (R.layout.main); Layout = This. Findviewbyid (R.id.buttonlayout); Surfaceview Surfaceview = (Surfaceview) This. Findviewbyid (R.id.surfaceview);        Surfaceview.getholder (). SetType (Surfaceholder.surface_type_push_buffers); Surfaceview.getholder (). Setfixedsize (176,144); Surfaceview.getholder (). Setkeepscreenon (true); Surfaceview.getholder (). Addcallback (NewSurfacecallback ()); } Public void takepicture(View v) {if(Camera! =NULL) {Switch(V.getid ()) { CaseR.id.takepicture:camera.takepicture (NULL,NULL,NewMypicturecallback ()); Break; CaseR.id.autofocus:camera.autofocus (NULL); Break; }        }    }Private Final  class mypicturecallback implements picturecallback {         Public void Onpicturetaken(byte[] data, camera camera) {Try{File Jpgfile =NewFile (Environment.getexternalstoragedirectory (), System.currenttimemillis () +". jpg"); FileOutputStream OutStream =NewFileOutputStream (Jpgfile);                Outstream.write (data);                Outstream.close ();            Camera.startpreview (); }Catch(Exception e)            {E.printstacktrace (); }        }    }Private Final  class surfacecallback implements Callback {         Public void surfacecreated(Surfaceholder Holder) {Try{camera = Camera.open ();//Turn on the cameraCamera.parameters Parameters = Camera.getparameters ();//LOG.I ("Mainactivity", Parameters.flatten ());Parameters.setpreviewsize ( -,480); Parameters.setpreviewframerate (5); Parameters.setpicturesize (1024x768,768); Parameters.setjpegquality ( the);                Camera.setparameters (parameters);                Camera.setpreviewdisplay (holder); Camera.startpreview ();//Start preview}Catch(Exception e)            {E.printstacktrace (); }        } Public void surfacechanged(Surfaceholder holder,intFormatintWidthintHeight) {} Public void surfacedestroyed(Surfaceholder Holder) {if(Camera! =NULL) {camera.release (); Camera =NULL; }        }    }@Override     Public Boolean ontouchevent(Motionevent event) {if(event.getaction () = = Motionevent.action_down) {layout.setvisibility (viewgroup.visible);return true; }return Super. Ontouchevent (event); }}

Third, add permissions

<uses-permission android:name="android.permission.CAMERA" />    <!-- 在SDCard中创建与删除文件权限 -->    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />    <!-- 往SDCard写入数据权限 -->    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

The effect is as follows:

The realization of the camera function of Android phone