Implementation of cropping and displaying images after taking photos on the android platform

MainActivity is as follows:

Package cn. testcamera;

Import java. io. File;

Import java. text. SimpleDateFormat;

Import java. util. Date;

Import android. app. Activity;

Import android. content. ContentResolver;

Import android. content. ContentUris;

Import android. content. Intent;

Import android. database. Cursor;

Import android. graphics. Bitmap;

Import android. graphics. BitmapFactory;

Import android.net. Uri;

Import android. OS. Bundle;

Import android. provider. MediaStore;

Import android. view. View;

Import android. widget. Button;

Import android. widget. ImageView;

Public class MainActivity extends Activity {

Private Button mButton;

Private ImageView mImageView;

Private File mPhotoFile;

Private String mPhotoPath;

Private Uri mPhotoOnSDCardUri;

Public final static int CAMERA_RESULT = 777;

Public final static int CAMERA_RESULT_CUT = 888;

Public final static int CAMERA_RESULT_CUT_OVER = 999;

Public final static String TAG = "xx ";

@ Override

Public void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. main );

MButton = (Button) findViewById (R. id. button );

MButton. setOnClickListener (new ButtonOnClickListener ());

MImageView = (ImageView) findViewById (R. id. imageView );

}

Private class ButtonOnClickListener implements View. OnClickListener {

Public void onClick (View v ){

Try {

Intent intent = new Intent ("android. media. action. IMAGE_CAPTURE ");

MPhotoPath = "mnt/sdcard/DCIM/Camera/" + getPhotoFileName ();

MPhotoFile = new File (mPhotoPath );

If (! MPhotoFile. exists ()){

MPhotoFile. createNewFile ();

}

MPhotoOnSDCardUri = Uri. fromFile (mPhotoFile );

Intent. putExtra (MediaStore. EXTRA_OUTPUT, mPhotoOnSDCardUri );

// Display the image after taking the photo

// StartActivityForResult (intent, CAMERA_RESULT );

// Modify the image before displaying it.

StartActivityForResult (intent, CAMERA_RESULT_CUT );

} Catch (Exception e ){

}

}

}

@ Override

Protected void onActivityResult (int requestCode, int resultCode, Intent data ){

Super. onActivityResult (requestCode, resultCode, data );

// 1. display the photo after taking the photo

If (requestCode = CAMERA_RESULT ){

Bitmap bitmap = BitmapFactory. decodeFile (mPhotoPath, null );

MImageView. setImageBitmap (bitmap );

}

// 2. Cut the photo and display it.

// 2.1 photograph and crop

If (requestCode = CAMERA_RESULT_CUT ){

Intent intent = new Intent (Intent. ACTION_MEDIA_SCANNER_SCAN_FILE, mPhotoOnSDCardUri );

SendBroadcast (intent );

Try {

Thread. sleep (2000 );

} Catch (InterruptedException e ){

E. printStackTrace ();

}

Uri systemImageUri = MediaStore. Images. Media. EXTERNAL_CONTENT_URI;

ContentResolver contentResolver = getContentResolver ();

Cursor cursor = contentResolver. query (systemImageUri, null,

MediaStore. Images. Media. DISPLAY_NAME + "= '"

+ MPhotoFile. getName () + "'", null, null );

Uri photoUriInMedia = null;

If (cursor! = Null & cursor. getCount ()> 0 ){

Cursor. moveToLast ();

Long id = cursor. getLong (0 );

PhotoUriInMedia = ContentUris. withAppendedId (systemImageUri, id );

}

Cursor. close ();

Intent in = new Intent ("com. android. camera. action. CROP ");

// The image format to be reduced

In. setDataAndType (photoUriInMedia, "image /*");

// Cut allowed

In. putExtra ("crop", "true ");

// Specifies the image width when the cropped ImageView is displayed.

In. putExtra ("outputX", 250 );

// Height of the image when the cropped ImageView is displayed

In. putExtra ("outputY", 250 );

// Set the width/height ratio of the cropping box.

In. putExtra ("aspectX", 1 );

In. putExtra ("aspectY", 1 );

In. putExtra ("return-data", true );

StartActivityForResult (in, CAMERA_RESULT_CUT_OVER );

}

// Display 2.2

If (requestCode = CAMERA_RESULT_CUT_OVER ){

// When you cut an image, if you give up, the data returned is null.

If (data! = Null ){

Bitmap bitmap = (Bitmap) data. getExtras (). get ("data ");

MImageView. setImageBitmap (bitmap );

}

}

}

Private String getPhotoFileName (){

Date date = new Date (System. currentTimeMillis ());

SimpleDateFormat dateFormat = new SimpleDateFormat ("'img '_ yyyyMMdd_HHmmss ");

Return dateFormat. format (date) + ". jpg ";

}

}

Main. xml is as follows:

<RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: layout_width = "match_parent" android: layout_height = "match_parent"> <Button android: id = "@ + id/button" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "click to take a photo"/> <ImageView android: id = "@ + id/imageView" android: layout_below = "@ id/button" android: layout_width = "fill_parent" android: layout_height = "wrap_content"/> </RelativeLayout>

Manifest. xml is as follows:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.testcamera"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="10" />    <uses-permission android:name="android.permission.CAMERA"/>    <uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />      <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:launchMode="singleTask"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>