Java android位图低质量问题
我刚刚创建了一些函数从相机中拍摄照片,并将结果图像放入imageview。我发现我的照片质量太差了 以下是一些代码:Java android位图低质量问题,java,android,xml,bitmap,Java,Android,Xml,Bitmap,我刚刚创建了一些函数从相机中拍摄照片,并将结果图像放入imageview。我发现我的照片质量太差了 以下是一些代码: @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) { Bitm
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
picture.setImageBitmap(photo);
}
}
View.OnClickListener camerabtnlistener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_help_3);
btnPicture = (Button) findViewById(R.id.btnPicture);
picture= (ImageView) findViewById(R.id.picture);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
layoutPic = (RelativeLayout) findViewById(R.id.layoutPic);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME, ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
btnPicture.setOnClickListener(camerabtnlistener);
}
还有xml
<ImageView
android:id="@+id/picture"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:src="@drawable/test_admin_big"
android:adjustViewBounds="true"/>
我已经在下面尝试了这些解决方案,但不起作用
请告知
感谢您使用Bundle extras=data.getExtras();在onActivityResult中,它将返回缩略图图像而不是实际图像 下面是我用来捕获和保存相机图像并将其显示到imageview的代码 您必须将相机图像保存到特定位置,然后从该位置提取 下面是打开“捕获摄影机图像”活动的方法
private static final int CAMERA_PHOTO = 111;
private Uri imageToUploadUri;
private void captureCameraImage() {
Intent chooserIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(Environment.getExternalStorageDirectory(), "POST_IMAGE.jpg");
chooserIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
imageToUploadUri = Uri.fromFile(f);
startActivityForResult(chooserIntent, CAMERA_PHOTO);
}
那么您的onActivityResult()方法应该是这样的
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_PHOTO && resultCode == Activity.RESULT_OK) {
if(imageToUploadUri != null){
Uri selectedImage = imageToUploadUri;
getContentResolver().notifyChange(selectedImage, null);
Bitmap reducedSizeBitmap = getBitmap(imageToUploadUri.getPath());
if(reducedSizeBitmap != null){
imageview.setImageBitmap(reducedSizeBitmap);
}else{
Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
}
}else{
Toast.makeText(this,"Error while capturing Image",Toast.LENGTH_LONG).show();
}
}
}
下面是onActivityResult()中使用的getBitmap()方法
我希望有帮助 只需创建您自己的文件夹,并在为相机创建意图时提供其uri,例如:
Intent Intent=newintent(android.provider.MediaStore.ACTION\u IMAGE\u CAPTURE);
fileUri=getOutputMediaFileUri.getOutputMediaFileUri(媒体类型图像);
intent.putExtra(MediaStore.EXTRA_输出,fileUri);
startActivityForResult(intent,0)
谢谢,我现在知道我使用缩略图在imageview中显示,所以我使用了您建议的实际图像。谢谢此错误:未能找到用户0的提供程序;应为此授权找到有效的ContentProvider
private Bitmap getBitmap(String path) {
Uri uri = Uri.fromFile(new File(path));
InputStream in = null;
try {
final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
in = getContentResolver().openInputStream(uri);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, o);
in.close();
int scale = 1;
while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
IMAGE_MAX_SIZE) {
scale++;
}
Log.d("", "scale = " + scale + ", orig-width: " + o.outWidth + ", orig-height: " + o.outHeight);
Bitmap b = null;
in = getContentResolver().openInputStream(uri);
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
o = new BitmapFactory.Options();
o.inSampleSize = scale;
b = BitmapFactory.decodeStream(in, null, o);
// resize to desired dimensions
int height = b.getHeight();
int width = b.getWidth();
Log.d("", "1th scale operation dimenions - width: " + width + ", height: " + height);
double y = Math.sqrt(IMAGE_MAX_SIZE
/ (((double) width) / height));
double x = (y / height) * width;
Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
(int) y, true);
b.recycle();
b = scaledBitmap;
System.gc();
} else {
b = BitmapFactory.decodeStream(in);
}
in.close();
Log.d("", "bitmap size - width: " + b.getWidth() + ", height: " +
b.getHeight());
return b;
} catch (IOException e) {
Log.e("", e.getMessage(), e);
return null;
}
}