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ListViewI中有16行.因此,当项目单击inListView打开图库并将图像设置为ListView时.但我的问题有时是afterstartActivityForResult(),oncreate()`方法调用.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);
这是一个非常活跃的结果
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),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;
}
}
在此ListView中选择6或7个图像后调用oncreate方法,在onactivityresult()之前.但是在oncreate()方法之后再次调用startactivity结果.请指导我是什么问题.谢谢InAdvance给所有人..
解决方法
before the onactivityresult(). But after oncreate() method again startactivity result called
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前台正在做的任何事情时,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 – 系统为您提供Activity.onSaveInstanceState回调,该回调将从将要被杀死的活动中调用,以便您有机会保存在被杀死之前需要保存的任何状态.
当你的活动将返回前景时 – 它将被重新创建(这就是为什么onCreate()再次调用),其中savedInstanceState参数不会为null.
savedInstanceState将保存包含您在onSavedInstanceState()回调中提供的所有额外内容的包.
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
