我正在尝试创建一个应用,用户可以使用相机拍摄照片并将其保存到指定的文件夹。但是,当它从imageView转换为PNG文件时,质量会大大降低。
我认为使用这段代码可以确保质量保持高水平
bmap.compress(Bitmap.CompressFormat.PNG, 100, output);
但即使我将质量从100改为较低的数字,我也看不出任何差异。
if (requestCode == cameraData && resultCode == RESULT_OK
&& null != data) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(photo);
// convert imageview to bitm
imageView.buildDrawingCache();
final Bitmap bmap = imageView.getDrawingCache();
addIt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
OutputStream output;
// Find the SD Card path
File filepath = Environment.getExternalStorageDirectory();
// Create a new folder AndroidBegin in SD Card
File dir = new File(filepath.getAbsolutePath()
+ "/filepath1/");
dir.mkdirs();
// Create a name for the saved image
File file = new File(dir, "image.png");
// Notify the user on successful save
Toast.makeText(Images.this, "Image Saved to SD Card",
Toast.LENGTH_SHORT).show();
try {
// Image starts saving
output = new FileOutputStream(file);
// Compress into png format image from 0% - 100%, using
// 100% for this tutorial
bmap.compress(Bitmap.CompressFormat.PNG, 100, output);
output.flush();
output.close();
Intent myIntent = new Intent(Images.this,
MyPreferencesActivity.class);
startActivity(myIntent);
}
// Catch exceptions
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
答案 0 :(得分:1)
呼叫
Bitmap photo = (Bitmap) data.getExtras().get("data");
仅返回图像的缩略图。按照本教程保存来自摄像头的图像:http://developer.android.com/training/camera/photobasics.html