我試圖從處理程序更改ActionBar的背景。最終目標是將Handler傳遞給AsyncTask,但是現在,即使從Thread中調用Handler.sendMessage()也會產生奇怪的行爲。通過調試器,我可以看到Handler接收到消息,然後運行setActionBarBackground()直到最後。ActionBar setBackgroundDrawable()從線程/處理程序清零背景
帶藍色底部筆觸的默認ActionBar完全從屏幕上消失,並且不會被新的GradientDrawable替換。我懷疑背景是某種程度上無效的。此外,當我再次關注EditText時,會出現正確的GradientDrawable ActionBar背景。我期望的行爲是在後臺對actionDone進行簡單更改。
任何有關爲什麼會發生這種情況的見解將不勝感激!
相關代碼:
TestActivity.java
public class TestActivity extends RoboSherlockFragmentActivity {
@InjectView(R.id.ET_test) EditText testET;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(MainApp.TAG, "onCreate");
setContentView(R.layout.test_activity);
testET.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
if (i == EditorInfo.IME_ACTION_DONE) {
String loc = testET.getText().toString();
InputMethodManager mgr = (InputMethodManager) getSystemService(
Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromWindow(testET.getWindowToken(), 0);
Toast.makeText(TestActivity.this, "EditText done!", Toast.LENGTH_SHORT).show();
/*TestQuery tq = new TestQuery(TestActivity.this, mHandler);
tq.execute();*/
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
mHandler.sendMessage(new Message());
}
}).start();
}
return true;
}
});
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
//setActivityColors();
setActionBarBackground();
}
};
private void setActionBarBackground() {
ActionBar ab = getSupportActionBar();
//Drawable d = WidgetUtils.getActionBarDrawable(TestActivity.this, 0xFF00FFFF);
GradientDrawable gd = new GradientDrawable(
GradientDrawable.Orientation.TOP_BOTTOM,
new int[]{0xFFFFFFFF, 0xFF000000});
gd.setCornerRadius(0f);
ab.setBackgroundDrawable(gd);
}
}
test_activity.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="button"/>
<EditText
android:id="@+id/ET_test"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:singleLine="true"
android:maxLines="1"
android:lines="1"
android:inputType="number"
android:imeOptions="actionDone"
android:nextFocusUp="@id/ET_test"
android:nextFocusLeft="@id/ET_test"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="button2"/>
</LinearLayout>
此操作無需標題。 –
感謝@Mat爲我工作,但如果你需要的標題你可以改變使標題:) – Antarix
的狀態,如果你不知道,如果標題顯示或不工作的:\t \t \t 布爾isDisplayingTitle =( actionBar.getDisplayOptions()&ActionBar.DISPLAY_SHOW_TITLE)!= 0; actionBar.setDisplayShowTitleEnabled(!isDisplayingTitle); actionBar.setDisplayShowTitleEnabled(isDisplayingTitle); –