Android - 黒の背景が灰色に変わる

Question

私はLinearLayoutの背景に（XMLで@android：color/blackを使用して）黒色を明示的に定義していますが、灰色（または透明な黒色）に変わります。

この問題は、エミュレータ、Acer Liquid（Android 2.2）とGalaxy Nexus（Android 4.1）の両方で多くのデバイスに表示されます。

スクリーンショット：//ここNot buggy viewBuggy view

は私のXMLおよびアクティビティコードです：

XML：

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical"> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="150dp" 
      android:minHeight="150dp"> 

      <ImageView 
       android:id="@+id/projectview_description_image" 
       android:layout_width="match_parent" 
       android:layout_height="150dp" 
       android:contentDescription="@string/projectview_description_image_description" 
       android:scaleType="centerCrop" 
       android:src="@drawable/project_nophoto" /> 

      <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_alignParentBottom="true" 
       android:orientation="vertical" 
       android:id="@+id/projectview_description_overlay" 
       android:paddingTop="5dp" 
       android:paddingLeft="10dp" 
       android:paddingBottom="5dp" 
       android:background="@android:color/black" 
       android:height="35dp"> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:id="@+id/projectview_description_title" 
        android:textAllCaps="true" 
        android:textColor="@android:color/white" 
        android:textSize="20dp" 
        android:textStyle="bold"/> 

       <TextView 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:id="@+id/projectview_description_baseline" 
        android:textColor="@android:color/white" 
        android:textStyle="italic" /> 

      </LinearLayout> 

     </RelativeLayout> 

     <!-- This LinearLayout background is buggy --> 
     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="40dp" 
      android:orientation="horizontal" 
      android:background="@android:color/black"> 

      <ImageView 
       android:layout_width="175dp" 
       android:layout_height="25dp" 
       android:layout_gravity="center_vertical" 
       android:paddingLeft="10dp" 
       android:paddingRight="10dp" 
       android:scaleType="fitCenter" 
       android:src="@drawable/project_status_finish" /> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center_vertical" 
       android:gravity="right" 
       android:paddingRight="10dp" 
       android:text="@string/projectview_description_website" 
       android:textColor="@color/website_link" 
       android:textSize="15dp" 
       android:id="@+id/projectview_description_website" /> 

     </LinearLayout> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:id="@+id/projectview_description_about_container" 
      android:padding="10dp" 
      android:paddingBottom="0dp"> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:text="@string/projectview_description_about" 
       android:textAllCaps="true" 
       android:textStyle="bold" /> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:id="@+id/projectview_description_about_text" /> 

     </LinearLayout> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:id="@+id/projectview_description_questions_container" /> 

    </LinearLayout> 

</ScrollView> 

活動：助けを

public class ProjectViewActivity extends Activity implements OnClickListener { 
    private boolean displayMenu = false; 
    private Intent shareIntent; 
    private FavoriteSqlite db; 
    private I4pProjectTranslation project; 

    @TargetApi(14) 
    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     if(displayMenu) { 
      // Inflate menu only if it hasn't been done before 
      if(menu.size() == 0) { 
       // Inflating the menu 
       MenuInflater inflater = getMenuInflater(); 
       inflater.inflate(R.menu.projectview, menu); 

       // Creating share intent 
       Intent prepareShareIntent = new Intent(Intent.ACTION_SEND); 
       prepareShareIntent.putExtra(Intent.EXTRA_TEXT, UriHelper.getProjectUrl(project)); 
       prepareShareIntent.putExtra(Intent.EXTRA_SUBJECT, project.getTitle()); 
       prepareShareIntent.setType("text/plain"); 
       shareIntent = Intent.createChooser(prepareShareIntent, getResources().getText(R.string.projectview_menu_share_dialog)); 
      } 

      // Defining favorite state 
      MenuItem favoriteItem = menu.getItem(0); 
      if(db.isFavorite(project)) 
       favoriteItem.setTitle(R.string.projectview_menu_favorites_remove); 
      else 
       favoriteItem.setTitle(R.string.projectview_menu_favorites_add); 
     } 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch(item.getItemId()) { 
     case android.R.id.home: 
      if(getIntent().getData() != null) { 
       Intent intent = new Intent(this, HomepageActivity.class); 
       intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK); 
       startActivity(intent); 
      } else 
       finish(); 
      break; 
     case R.id.projectview_favorite: 
      Toast t; 
      if(db.isFavorite(project)) { 
       db.removeFavorite(project); 
       t = Toast.makeText(this, getResources().getString(R.string.projectview_toast_favorites_remove, project.getTitle()), Toast.LENGTH_SHORT); 
      } else { 
       db.addFavorite(project); 
       t = Toast.makeText(this, getResources().getString(R.string.projectview_toast_favorites_add, project.getTitle()), Toast.LENGTH_SHORT); 
      } 
      t.show(); 
      break; 
     case R.id.projectview_share: 
      startActivity(shareIntent); 
      break; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    @TargetApi(11) 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     if(Build.VERSION.SDK_INT < 11) 
      requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.loading); 
     db = new FavoriteSqlite(this); 

     if(Build.VERSION.SDK_INT >= 11) 
      getActionBar().setDisplayHomeAsUpEnabled(true); 

     project = (I4pProjectTranslation) getLastNonConfigurationInstance(); 
     if(project != null) 
      displayProject(); 
     else { 
      String projectLang; 
      String projectSlug; 

      Uri data = getIntent().getData(); 
      if(data != null) { 
       List<String> path = data.getPathSegments(); 
       projectLang = path.get(0); 
       projectSlug = path.get(2); 
      } else { 
       Bundle extras = getIntent().getExtras(); 

       if(extras.containsKey("project_title")) 
        setTitle(extras.getString("project_title")); 

       projectLang = extras.getString("project_lang"); 
       projectSlug = extras.getString("project_slug"); 
      } 

      ProjectViewHandler handler = new ProjectViewHandler(this); 
      ProjectViewThread thread = new ProjectViewThread(handler, projectLang, projectSlug); 

      thread.start(); 
     } 
    } 

    @Override 
    public Object onRetainNonConfigurationInstance() { 
     return project; 
    } 

    public void setProject(I4pProjectTranslation p) { 
     project = p; 
    } 

    @TargetApi(11) 
    public void displayProject() { 
     setContentView(R.layout.projectview_description); 
     displayMenu = true; 
     if(Build.VERSION.SDK_INT >= 11) 
      invalidateOptionsMenu(); // Rebuild the menu 

     setTitle(project.getTitle()); 

     LinearLayout overlay = (LinearLayout) findViewById(R.id.projectview_description_overlay); 
     overlay.getBackground().setAlpha(127); 

     if(project.getProject().getPictures().size() > 0) { 
      ImageView image = (ImageView) findViewById(R.id.projectview_description_image); 
      image.setImageBitmap(project.getProject().getPictures().get(0).getImageBitmap()); 
     } 

     TextView title = (TextView) findViewById(R.id.projectview_description_title); 
     title.setText(project.getTitle()); 

     TextView baseline = (TextView) findViewById(R.id.projectview_description_baseline); 
     baseline.setText(project.getBaseline()); 

     TextView website = (TextView) findViewById(R.id.projectview_description_website); 
     if("".equals(project.getProject().getWebsite())) 
      website.setVisibility(View.GONE); 
     else 
      website.setOnClickListener(this); 

     if("".equals(project.getAboutSection())) { 
      LinearLayout aboutContainer = (LinearLayout) findViewById(R.id.projectview_description_about_container); 
      aboutContainer.setVisibility(View.GONE); 
     } else { 
      TextView aboutText = (TextView) findViewById(R.id.projectview_description_about_text); 
      aboutText.setText(project.getAboutSection()); 
     } 

     LinearLayout questions = (LinearLayout) findViewById(R.id.projectview_description_questions_container); 
     for(Question question : project.getProject().getQuestions()) { 
      if(question.getAnswer() != null) { 
       LinearLayout questionLayout = (LinearLayout) getLayoutInflater().inflate(R.layout.projectview_question, null); 

       TextView questionView = (TextView) questionLayout.findViewById(R.id.projectview_question_question); 
       TextView answerView = (TextView) questionLayout.findViewById(R.id.projectview_question_answer); 

       questionView.setText(question.getQuestion()); 
       answerView.setText(question.getAnswer().trim()); 

       questions.addView(questionLayout); 
      } 
     } 
    } 

    public void onClick(View arg0) { 
     Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(project.getProject().getWebsite())); 
     startActivity(intent); 
    } 
} 

ありがとう！

Answer 1

これは、フレームワークのキャッシュメカニズムのバグが原因です。最も簡単な回避策は、ほとんど黒色の色を使用することです（#ff010101など）。

Answer 2

レイアウトのすべてのインスタンスで黒色の属性を定義する代わりに、その属性でカスタムスタイルを設定しようとしましたか？一方ではメンテナンスには優れていますが、スタイリングエンジンは構成の変更をうまく処理して問題が解決される可能性があります。