android 系统图片剪裁

最新推荐文章于 2021-05-27 12:07:19 发布

原创最新推荐文章于 2021-05-27 12:07:19 发布 · 置顶 · 945 阅读

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#图片剪裁

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本文介绍了一个Android应用中如何实现拍照并进行图片裁剪的功能。通过创建按钮点击事件触发相机拍照，保存照片到SD卡，并通过广播扫描更新相册。接着使用ContentResolver查询最新照片路径，启动系统裁剪功能，最后将裁剪后的图片显示在ImageView中。

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package cn.test;

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.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class CutActivity extends Activity {
   private Button button;
   private ImageView imageView;
   private File mCurrentPhotoFile;
   private Bitmap cameraBitmap;

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       button = (Button) findViewById(R.id.button);
       imageView = (ImageView) findViewById(R.id.imageView);
       button.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {
               Intent intent = new Intent(
               "android.media.action.IMAGE_CAPTURE");
               mCurrentPhotoFile = new File(
                       "mnt/sdcard/DCIM/Camera/",
                       getPhotoFileName());
           intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mCurrentPhotoFile));
       startActivityForResult(
               intent,
               Activity.DEFAULT_KEYS_DIALER);
           }


       });
   }

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

       switch (requestCode) {
       case 1:
           Uri imgUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
           ContentResolver cr = CutActivity.this
                   .getContentResolver();

           Uri fileUri = Uri.fromFile(mCurrentPhotoFile);
           sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                   fileUri));
           try {
               Thread.sleep(3000);
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
           Cursor cursor = cr
                   .query(imgUri, null,
                           MediaStore.Images.Media.DISPLAY_NAME + "='"
                                   + mCurrentPhotoFile.getName() + "'",
                           null, null);
           Uri uri = null;
           if (cursor != null && cursor.getCount() > 0) {
               cursor.moveToLast();
               long id = cursor.getLong(0);
               uri = ContentUris.withAppendedId(imgUri, id);
           }
           final Intent intent = new Intent(
                   "com.android.camera.action.CROP");
           intent.setDataAndType(uri, "image/*");
           intent.putExtra("crop", "true");
           intent.putExtra("outputX", 380);
           intent.putExtra("outputY", 500);
           intent.putExtra("return-data", true);
           CutActivity.this.startActivityForResult(intent, 3);
           break;
       case 2:
           break;
       case 3:
           if (data != null) {
               cameraBitmap = (Bitmap) data.getExtras().get("data");
               imageView.setImageBitmap(cameraBitmap);
           }
           break;
       default:
           break;
       }
       super.onActivityResult(requestCode, resultCode, data);
   }

   private String getPhotoFileName() {
       Date date = new Date(System.currentTimeMillis());
       SimpleDateFormat dateFormat = new SimpleDateFormat(
               "'IMG'_yyyyMMdd_HHmmss");
       return dateFormat.format(date) + ".jpg";

   }
}