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我在創建自定義ActionBar時在setBackgroundDrawable上得到NullPointerException。 保護無效onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState);setBackgroundDrawable拋出NullPointerException創建Android自定義ActionBar
setContentView(R.layout.activity_main);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
ActionBar actionBar = getActionBar();
Bitmap b = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
actionBar.setBackgroundDrawable(new BitmapDrawable(getResources(), b));
actionBar.setCustomView(R.layout.actionbar_view);
logcat的結果如下:
Caused by: java.lang.NullPointerException
at actionbarcustomview.practice.nkd.actionbarcustomviews.MainActivity.onCreate(MainActivity.java:30)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
線30
actionBar.setBackgroundDrawable(new BitmapDrawable(getResources(), b));
我使用的Android Studio和CONFIGS是
defaultConfig {
applicationId "actionbarcustomview.practice.nkd.actionbarcustomviews"
minSdkVersion 17
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
請幫我解決這個問題。
爲什麼不只是Log.d的actionBar的值? – pskink