[英]App Crashed if trying to get Bitmap Image from Assets Folder in Android ?
我在資產文件夾中放置了一些圖像,如果在資產文件夾中找不到圖像,則嘗試將圖像名稱從db傳遞給函數,然后我的應用崩潰了。...如果找不到圖像,我如何擺脫這個問題呢?有可能在imageview中顯示任何文本或任何默認圖像,而不是應用程序崩潰了。...這是代碼:
private Bitmap getBitmapFromAsset(String strName) {
AssetManager assetManager = getAssets();
InputStream istr = null;
try {
istr = assetManager.open(strName);
} catch (IOException e) {
e.printStackTrace();
}
Bitmap bitmap = BitmapFactory.decodeStream(istr);
return bitmap;
}
當我將“ imageName”從數據庫傳遞給函數時,如果找不到該圖像,則顯示我錯誤並且我的應用程序崩潰了。有人可以幫助我更正代碼,以便我可以知道圖像是否存在,如果圖像存在然后在imageview中設置它,如果找不到圖像,則在其中顯示任何虛擬圖像.......
這是Logcat:
02-15 14:59:43.275: E/AndroidRuntime(467): FATAL EXCEPTION: main
02-15 14:59:43.275: E/AndroidRuntime(467): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jamia.binoria/com.jamia.binoria.GeneralTopicQuestions}: java.lang.NullPointerException
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.os.Handler.dispatchMessage(Handler.java:99)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.os.Looper.loop(Looper.java:126)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread.main(ActivityThread.java:3997)
02-15 14:59:43.275: E/AndroidRuntime(467): at java.lang.reflect.Method.invokeNative(Native Method)
02-15 14:59:43.275: E/AndroidRuntime(467): at java.lang.reflect.Method.invoke(Method.java:491)
02-15 14:59:43.275: E/AndroidRuntime(467): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
02-15 14:59:43.275: E/AndroidRuntime(467): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
02-15 14:59:43.275: E/AndroidRuntime(467): at dalvik.system.NativeStart.main(Native Method)
02-15 14:59:43.275: E/AndroidRuntime(467): Caused by: java.lang.NullPointerException
02-15 14:59:43.275: E/AndroidRuntime(467): at com.jamia.binoria.GeneralTopicQuestions.GetQuestionDataForQuranHadeesBean(GeneralTopicQuestions.java:152)
02-15 14:59:43.275: E/AndroidRuntime(467): at com.jamia.binoria.GeneralTopicQuestions.onCreate(GeneralTopicQuestions.java:75)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
02-15 14:59:43.275: E/AndroidRuntime(467): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)
02-15 14:59:43.275: E/AndroidRuntime(467): ... 11 more
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