[英]App Crashed if trying to get Bitmap Image from Assets Folder in Android ?
我在资产文件夹中放置了一些图像,如果在资产文件夹中找不到图像,则尝试将图像名称从db传递给函数,然后我的应用崩溃了。...如果找不到图像,我如何摆脱这个问题呢?有可能在imageview中显示任何文本或任何默认图像,而不是应用程序崩溃了。...这是代码:
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;
}
当我将“ imageName”从数据库传递给函数时,如果找不到该图像,则显示我错误并且我的应用程序崩溃了。有人可以帮助我更正代码,以便我可以知道图像是否存在,如果图像存在然后在imageview中设置它,如果找不到图像,则在其中显示任何虚拟图像.......
这是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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