android平台拍照後先剪裁再顯示圖片實現方法

來源:互聯網
上載者:User

  mainActivity如下:

  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);

  //拍照後顯示此圖片

  //startActivityForResult(intent,CAMERA_RESULT);

  //拍照後先修改再顯示此圖片

  startActivityForResult(intent,CAMERA_RESULT_CUT);

  } catch (Exception e) {

  }

  }

  }

  @Override

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

  super.onActivityResult(requestCode, resultCode, data);

  //1 拍照後顯示照片

  if (requestCode==CAMERA_RESULT) {

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

  mImageView.setImageBitmap(bitmap);

  }

  //2 拍照後剪下照片,然後顯示

  //2.1拍照且剪裁

  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");

  //需要裁減的圖片格式

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

  //允許裁減

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

  //剪裁後ImageView顯時圖片的寬

  in.putExtra("outputX", 250);

  //剪裁後ImageView顯時圖片的高

  in.putExtra("outputY", 250);

  //設定剪裁框的寬高比例

  in.putExtra("aspectX", 1);

  in.putExtra("aspectY", 1);

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

  startActivityForResult(in, CAMERA_RESULT_CUT_OVER);

  }

  //2.2顯示

  if (requestCode==CAMERA_RESULT_CUT_OVER) {

  //剪下圖片的時候,若"放棄"則回答的data為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如下:

<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="點擊按鈕拍照"     />    <ImageView         android:id="@+id/imageView"        android:layout_below="@id/button"        android:layout_width="fill_parent"        android:layout_height="wrap_content"     /></RelativeLayout>

manifest.xml如下:

<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>

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