在我的应用程序中,我想从Gallery
中选择图像并在ListView
中设置图像。在我的ListView I have 16 rows. So when ever item click in
ListView open the gallery and set the image to
ListView . But my problem is some times after
startActivityForResult(),
oncreate()`方法中调用。这是onclick代码
Intent intent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(
Intent.createChooser(intent, "Select File"),
SELECT_PICTURE);
这是onactivityresult
public void onActivityResult(int requestcode, int resultcode, Intent data) {
Log.e("result", "result");
displayMetrics = this.getResources().getDisplayMetrics();
Ew = displayMetrics.widthPixels;
Eh = displayMetrics.heightPixels;
switch (requestcode) {
case SELECT_PICTURE:
if (resultcode == RESULT_OK) {
lelListLayout.setVisibility(View.GONE);
relImageLayout.setVisibility(View.VISIBLE);
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
ExifInterface exif = null;
// Bitmap bmRotated = null;
try {
exif = new ExifInterface(selectedImagePath);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_UNDEFINED);
Log.e("Orientation==>", "" + orientation);
try {
bmRotated = null;
bmGallayImage = null;
trimCache();
bmGallayImage = convertBitmap(selectedImagePath);
bmRotated = InventorySubmitImagesActivity.rotateBitmap(
bmGallayImage, orientation);
// if(bmRotated.getWidth()>bmRotated.getHeight()){
if (bmRotated.getWidth() > 1024) {
float x = 0;
x = 1024 / (float) bmRotated.getWidth();
// Log.e("x====","value "+x);
bmRotated = Bitmap.createScaledBitmap(bmRotated, 1024,
(int) (bmRotated.getHeight() * x), true);
}
/*
* }else{ if(bmRotated.getHeight() > 1024){ float x=0;
* x=1024/(float)bmRotated.getHeight();
* Log.e("x====","value "+x);
*
* bmRotated = Bitmap.createScaledBitmap(bmRotated,
* (int)(bmRotated.getWidth()*x), 1024, true); } }
*/
Eh = Eh - ll_buttonlayout.getHeight();
float iw = bmRotated.getWidth();
float ih = bmRotated.getHeight();
float diff = Ew / iw;
float layoutwidth = Ew;
float layoutheight = diff * ih;
if (layoutheight > Eh) {
diff = Eh / ih;
layoutwidth = Ew * diff;
layoutheight = Eh;
}
bmGallayImage = bmRotated;
if (bmRotated != null) {
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
(int) layoutwidth, (int) layoutheight);
relImage.setLayoutParams(layoutParams);
Drawable dr = new BitmapDrawable(bmRotated);
old_width = bmRotated.getWidth();
old_height = bmRotated.getHeight();
relImage.setBackgroundDrawable(dr);
}
left = (int) layoutwidth / 2 - 34;
top = (int) layoutheight / 2 - 8;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// drag_check=true;
relImage.removeAllViews();
imgMarker = new ImageView(this);
final RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.MATCH_PARENT);
relImage.addView(imgMarker, layoutParams);
imgMarker.setScaleType(ImageView.ScaleType.MATRIX);
bmdragImage = BitmapFactory.decodeResource(getResources(),
R.drawable.image_marker);
imgMarker.setImageBitmap(bmdragImage);
matrix = new Matrix();
savedMatrix = new Matrix();
oldDist = 0f;
start = new PointF();
mid = new PointF();
matrix.postTranslate(left, top);
imgMarker.setImageMatrix(matrix);
imgMarker.setOnTouchListener(RefurbishmentImageActivity.this);
imgMarker.setVisibility(View.VISIBLE);
// end..
// }
}
break;
} }
在ListView
之后,在onactivityresult()
之前选择了6或7个图像的oncreate方法。但是在oncreate()
方法后再次调用startactivity结果。请指导我是什么问题。谢谢InAdvance to all ..
答案 0 :(得分:9)
在onactivityresult()之前。但是在oncreate()方法之后,再次将startactivity结果称为
当Activity被发送到后台时(当其他活动在其上面时,或者当它被主页按钮发送到后台时),只要系统没有内存压力,它的实例就会保持活动状态。当系统没有足够的内存来处理它当前在前台做的任何事情时,它通常会通过停止和释放内存后台活动来重新声明内存。
在这种情况下 - 系统会为您提供Activity.onSaveInstanceState
回调,该回调将从将被杀死的活动中调用,以便您有机会保存在此之前需要保存的任何状态。 #39;被杀
当您的活动将返回到前台时 - 它将被重新创建(这就是为什么onCreate()再次调用的原因),saveInstanceState参数不会为空。
savedInstanceState将保存包含您在onSavedInstanceState()回调中提供的所有额外内容的包。
理解这一点非常重要。
为了更好地理解,我建议你认真阅读 - http://developer.android.com/training/basics/activity-lifecycle/recreating.html
答案 1 :(得分:1)
可能是选择选择器的对话框对于系统而言太大了,它通过缓存您的应用程序来减少内存。检查是在onCreate
之前调用的方法onSaveInstanceState。如果是,那么您可以将所需数据保存在bundle中并将其加载到onCreate
方法