imageview添加图片代码——内存和相…

最新推荐文章于 2025-04-16 20:53:51 发布

AndroidObject

最新推荐文章于 2025-04-16 20:53:51 发布

阅读量849

点赞数

CC 4.0 BY-SA版权

分类专栏： android开发基础

本文链接：https://blog.youkuaiyun.com/anroidfinalbreak/article/details/33728605

android开发基础专栏收录该内容

35 篇文章

订阅专栏

本文介绍了一个简单的Android应用中实现图片选择器的方法。通过使用Intent从相册或相机选择图片，并在Activity中处理返回的数据来展示所选图片。文章详细解释了如何根据不同来源的图片进行适配和显示。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public void onClick(View view) {
switch (view.getId()) {
//点击本地图片

   case R.id.localbutton:
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent, 2);
        dismiss();
        break;

//点击相机添加图片
   case R.id.photobutton:
        Intent intentphoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intentphoto, 1);
        dismiss();
        break;
//返回

   case R.id.canclebutton:
        cancel();
        break;
   }
  }
}

//接受图片内容

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  super.onActivityResult(requestCode, resultCode, data);
  if (resultCode == Activity.RESULT_OK) {
   switch (requestCode) {
   case 2: //sd卡获取的图片URI
    myDialog.cancel();
    imageBackground.setVisibility(View.GONE);
    twoCodeImage.setVisibility(View.VISIBLE);
    Uri uri = data.getData();
    getImage(uri); //该方法将图片URI转为图片
    break;
   case 1: //相机获取的图片数据，直接填充imageview
    myDialog.cancel();
    imageBackground.setVisibility(View.GONE);
    twoCodeImage.setVisibility(View.VISIBLE);
    Bundle extras = data.getExtras();
    bitmap = (Bitmap) extras.get("data");
    twoCodeImage.setImageBitmap(bitmap);
     break;
   default:
    break;
   }
  }
}

private void getImage(Uri paramUri) {
  int j = 1;
  if ((this.bitmap != null) && (!this.bitmap.isRecycled())) {
   this.bitmap.recycle();
   this.bitmap = null;
   System.gc();
  }
  ContentResolver localContentResolver = getContentResolver();
  BitmapFactory.Options localOptions1 = new BitmapFactory.Options();
  localOptions1.inJustDecodeBounds = true;
  try {
   Bitmap localBitmap1 = BitmapFactory.decodeStream(
     localContentResolver.openInputStream(paramUri), null,
     localOptions1);
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  if ((localOptions1.outHeight > 480) || (localOptions1.outWidth > 480)) {
   int k = localOptions1.outHeight;
   int m = localOptions1.outWidth;
   double d1 = Math.max(k, m);
   double d2 = Math.log(480.0D / d1);
   double d3 = Math.log(0.5D);
   double d4 = (int) Math.round(d2 / d3);
   j = (int) Math.pow(2.0D, d4);
   BitmapFactory.Options localOptions2 = new BitmapFactory.Options();
   localOptions2.inSampleSize = j * 2;
   localOptions2.inJustDecodeBounds = false;
   Bitmap localBitmap2;
   try {
    localBitmap2 = BitmapFactory.decodeStream(
      localContentResolver.openInputStream(paramUri), null,
      localOptions2);
    this.bitmap = localBitmap2;
   } catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  } else {
   if (paramUri.getScheme().equals("content")) {
    Cursor cursor = getContentResolver().query(paramUri, null,
      null, null, null);
    cursor.moveToFirst();
    filePath = cursor.getString(1);
    cursor.close();
   } else {
    filePath = paramUri.toString();
    filePath = filePath.replace("file://", "");
   }
   this.bitmap = BitmapFactory.decodeFile(filePath);
   int width = 480;
   float scaleWidth = 0;
   float scaleHeight = 0;
   int w = bitmap.getWidth();
   if (w * 1.5 <= 480) {
    scaleWidth = (float) width / w;
    scaleHeight = (float) width / w;
   } else {
    scaleWidth = 1;
    scaleHeight = 1;
   }
   if (!(scaleWidth == 1 && scaleHeight == 1)) {
    Matrix matrix = new Matrix(); // 创建操作图片用的Matrix对象
    matrix.postScale(scaleWidth, scaleHeight);
    if (bitmap.getWidth() < bitmap.getHeight())
     matrix.postRotate(90); // 设置缩放比例
    Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0,
      bitmap.getWidth(), bitmap.getHeight(), matrix, true);// 建立新的bitmap，其内容是对原bitmap的缩放后的图
    this.bitmap = newbmp;
   }
  }
  if (this.bitmap != null) {
   twoCodeImage.setImageBitmap(bitmap);
  }
}