我試圖從SD卡中獲取圖像到位圖中顯示Image-view.After應用程序的前兩到三個圖像顯示,但當我滾動列表應用程序崩潰,並獲得NullPointerException異常:java.lang.NullPointerException:嘗試調用虛擬方法'int android.graphics.Bitmap.getWidth()'null對象引用 在com.example.tazeen.classnkk.Activity1 $ MyListAdapter.getView(Activity1.java:357)Android:NullPointerException:嘗試調用空虛對象的虛擬方法'int android.graphics.Bitmap.getWidth()'參考
if(objElement.endsWith(mp3_Pattern))
{
Log.e("Mp3 ", " ends with ");
{
int scalFactor = fixHeight/h ;
newWidth = (int)(w * scalFactor);
Log.e("scalFactor "," = " + scalFactor);
Log.e("newWidth "," = " + newWidth);
Log.e("resizing... ","in if condition");
new_Height = fixHeight ;
}
else
{
newWidth = w;
new_Height = h;
}
Uri uri = Uri.fromFile(new File(objElement));
Picasso.with(getContext()).load(uri).resize(newWidth, new_Height).placeholder(R.drawable.img_placeholder).into(imageView , new com.squareup.picasso.Callback() {
@Override
public void onSuccess() {
if (pBar != null) {
pBar.setVisibility(View.GONE);
}
}
@Override
public void onError() {
}
});
}
holder.linearLayout.addView(imageView);
holder.linearLayout.addView(pBar);
這裏是記錄了信息離子
08-28 14:22:14.077 2947-2947/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.tazeen.classnkk, PID: 2947
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
at com.example.tazeen.classnkk.AllPosts_Page$MyListAdapter.getView(AllPosts_Page.java:357)
at android.widget.AbsListView.obtainView(AbsListView.java:2347)
at android.widget.ListView.makeAndAddView(ListView.java:1864)
at android.widget.ListView.fillDown(ListView.java:698)
at android.widget.ListView.fillGap(ListView.java:662)
at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4991)
at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3418)
at android.widget.AbsListView.onTouchMove(AbsListView.java:3801)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3632)
at android.view.View.dispatchTouchEvent(View.java:8471)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
但在我的字符串objElement中:已經獲取sd卡路徑,如objElement:= /mnt/sdcard/SDImages/95_20150824112324025.png。 – androidTag
我試過上面的代碼,但bitmapSize爲空爲什麼 – androidTag
我已更新的答案也參考http://stackoverflow.com/a/8710690/1552136。如果沒有解決這個讓我知道我會試試這個。 – harshitpthk