Android – 黑色背景变成灰色

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我明确地为我的LinearLayout的背景定义了一种黑色(在我的 XML中使用@android：color / black),但有时(通常在屏幕旋转后),黑色变成灰色(或透明的黑色) ). @H_301_2@此问题出现在许多设备上：模拟器,Acer Liquid(Android 2.2)和Galaxy Nexus(Android 4.1).

@H_301_2@截图：Buggy view // Not buggy view

@H_301_2@这是我的XML和活动代码：

@H_301_2@XML：

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  3.     android:layout_width="match_parent"
  4.     android:layout_height="match_parent">
  5.  
  6.     <LinearLayout
  7.         android:layout_width="match_parent"
  8.         android:layout_height="wrap_content"
  9.         android:orientation="vertical">
  10.  
  11.         <RelativeLayout
  12.             android:layout_width="match_parent"
  13.             android:layout_height="150dp"
  14.             android:minHeight="150dp">
  15.  
  16.             <ImageView
  17.                 android:id="@+id/projectview_description_image"
  18.                 android:layout_width="match_parent"
  19.                 android:layout_height="150dp"
  20.                 android:contentDescription="@string/projectview_description_image_description"
  21.                 android:scaleType="centerCrop"
  22.                 android:src="@drawable/project_nophoto" />
  23.  
  24.             <LinearLayout
  25.                 android:layout_width="match_parent"
  26.                 android:layout_height="wrap_content"
  27.                 android:layout_alignParentBottom="true"
  28.                 android:orientation="vertical"
  29.                 android:id="@+id/projectview_description_overlay"
  30.                 android:paddingTop="5dp"
  31.                 android:paddingLeft="10dp"
  32.                 android:paddingBottom="5dp"
  33.                 android:background="@android:color/black"
  34.                 android:height="35dp">
  35.  
  36.                 <TextView
  37.                     android:layout_width="match_parent"
  38.                     android:layout_height="wrap_content"
  39.                     android:id="@+id/projectview_description_title"
  40.                     android:textAllCaps="true"
  41.                     android:textColor="@android:color/white"
  42.                     android:textSize="20dp"
  43.                     android:textStyle="bold"/>
  44.  
  45.                 <TextView
  46.                     android:layout_width="match_parent"
  47.                     android:layout_height="wrap_content"
  48.                     android:id="@+id/projectview_description_baseline"
  49.                     android:textColor="@android:color/white"
  50.                     android:textStyle="italic" />
  51.  
  52.             </LinearLayout>
  53.  
  54.         </RelativeLayout>
  55.  
  56.         <!-- This LinearLayout background is buggy -->
  57.         <LinearLayout
  58.             android:layout_width="match_parent"
  59.             android:layout_height="40dp"
  60.             android:orientation="horizontal"
  61.             android:background="@android:color/black">
  62.  
  63.             <ImageView
  64.                 android:layout_width="175dp"
  65.                 android:layout_height="25dp"
  66.                 android:layout_gravity="center_vertical"
  67.                 android:paddingLeft="10dp"
  68.                 android:paddingRight="10dp"
  69.                 android:scaleType="fitCenter"
  70.                 android:src="@drawable/project_status_finish" />
  71.  
  72.             <TextView
  73.                 android:layout_width="match_parent"
  74.                 android:layout_height="wrap_content"
  75.                 android:layout_gravity="center_vertical"
  76.                 android:gravity="right"
  77.                 android:paddingRight="10dp"
  78.                 android:text="@string/projectview_description_website"
  79.                 android:textColor="@color/website_link"
  80.                 android:textSize="15dp"
  81.                 android:id="@+id/projectview_description_website" />
  82.  
  83.         </LinearLayout>
  84.  
  85.         <LinearLayout
  86.             android:layout_width="match_parent"
  87.             android:layout_height="wrap_content"
  88.             android:orientation="vertical"
  89.             android:id="@+id/projectview_description_about_container"
  90.             android:padding="10dp"
  91.             android:paddingBottom="0dp">
  92.  
  93.             <TextView
  94.                 android:layout_width="match_parent"
  95.                 android:layout_height="wrap_content"
  96.                 android:text="@string/projectview_description_about"
  97.                 android:textAllCaps="true"
  98.                 android:textStyle="bold" />
  99.  
  100.             <TextView
  101.                 android:layout_width="match_parent"
  102.                 android:layout_height="wrap_content"
  103.                 android:id="@+id/projectview_description_about_text" />
  104.  
  105.         </LinearLayout>
  106.  
  107.         <LinearLayout
  108.             android:layout_width="match_parent"
  109.             android:layout_height="wrap_content"
  110.             android:orientation="vertical"
  111.             android:id="@+id/projectview_description_questions_container" />
  112.  
  113.     </LinearLayout>
  114.  
  115. </ScrollView>
@H_301_2@活动：

  1. public class ProjectViewActivity extends Activity implements OnClickListener {
  2.     private boolean displayMenu = false;
  3.     private Intent shareIntent;
  4.     private Favoritesqlite db;
  5.     private I4pProjectTranslation project;
  6.  
  7.     @TargetApi(14)
  8.     @Override
  9.     public boolean onPrepareOptionsMenu(Menu menu) {
  10.         if(displayMenu) {
  11.             // Inflate menu only if it hasn't been done before
  12.             if(menu.size() == 0) {
  13.                 // Inflating the menu
  14.                 MenuInflater inflater = getMenuInflater();
  15.                 inflater.inflate(R.menu.projectview,menu);
  16.  
  17.                 // Creating share intent
  18.                 Intent prepareShareIntent = new Intent(Intent.ACTION_SEND);
  19.                 prepareShareIntent.putExtra(Intent.EXTRA_TEXT,UriHelper.getProjectUrl(project));
  20.                 prepareShareIntent.putExtra(Intent.EXTRA_SUBJECT,project.getTitle());
  21.                 prepareShareIntent.setType("text/plain");
  22.                 shareIntent = Intent.createChooser(prepareShareIntent,getResources().getText(R.string.projectview_menu_share_dialog));
  23.             }
  24.  
  25.             // Defining favorite state
  26.             MenuItem favoriteItem = menu.getItem(0);
  27.             if(db.isFavorite(project))
  28.                 favoriteItem.setTitle(R.string.projectview_menu_favorites_remove);
  29.             else
  30.                 favoriteItem.setTitle(R.string.projectview_menu_favorites_add);
  31.         }
  32.         return super.onCreateOptionsMenu(menu);
  33.     }
  34.  
  35.     @Override
  36.     public boolean onOptionsItemSelected(MenuItem item) {
  37.         switch(item.getItemId()) {
  38.         case android.R.id.home:
  39.             if(getIntent().getData() != null) {
  40.                 Intent intent = new Intent(this,HomepageActivity.class);
  41.                 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
  42.                 startActivity(intent);
  43.             } else 
  44.                 finish();
  45.             break;
  46.         case R.id.projectview_favorite:
  47.             Toast t;
  48.             if(db.isFavorite(project)) {
  49.                 db.removeFavorite(project);
  50.                 t = Toast.makeText(this,getResources().getString(R.string.projectview_toast_favorites_remove,project.getTitle()),Toast.LENGTH_SHORT);
  51.             } else {
  52.                 db.addFavorite(project);
  53.                 t = Toast.makeText(this,getResources().getString(R.string.projectview_toast_favorites_add,Toast.LENGTH_SHORT);
  54.             }
  55.             t.show();
  56.             break;
  57.         case R.id.projectview_share:
  58.             startActivity(shareIntent);
  59.             break;
  60.         }
  61.         return super.onOptionsItemSelected(item);
  62.     }
  63.  
  64.     @TargetApi(11)
  65.     @Override
  66.     protected void onCreate(Bundle savedInstanceState) {
  67.         super.onCreate(savedInstanceState);
  68.         if(Build.VERSION.SDK_INT < 11)
  69.             requestWindowFeature(Window.FEATURE_NO_TITLE);
  70.         setContentView(R.layout.loading);
  71.         db = new Favoritesqlite(this);
  72.  
  73.         if(Build.VERSION.SDK_INT >= 11)
  74.             getActionBar().setDisplayHomeAsUpEnabled(true);
  75.  
  76.         project = (I4pProjectTranslation) getLastNonConfigurationInstance();
  77.         if(project != null)
  78.             displayProject();
  79.         else {
  80.             String projectLang;
  81.             String projectSlug;
  82.  
  83.             Uri data = getIntent().getData();
  84.             if(data != null) {
  85.                 List<String> path = data.getPathSegments();
  86.                 projectLang = path.get(0);
  87.                 projectSlug = path.get(2);
  88.             } else {
  89.                 Bundle extras = getIntent().getExtras();
  90.  
  91.                 if(extras.containsKey("project_title"))
  92.                     setTitle(extras.getString("project_title"));
  93.  
  94.                 projectLang = extras.getString("project_lang");
  95.                 projectSlug = extras.getString("project_slug");
  96.             }
  97.  
  98.             ProjectViewHandler handler = new ProjectViewHandler(this);
  99.             ProjectViewThread thread = new ProjectViewThread(handler,projectLang,projectSlug);
  100.  
  101.             thread.start();
  102.         }
  103.     }
  104.  
  105.     @Override
  106.     public Object onRetainNonConfigurationInstance() {
  107.         return project;
  108.     }
  109.  
  110.     public void setProject(I4pProjectTranslation p) {
  111.         project = p;
  112.     }
  113.  
  114.     @TargetApi(11)
  115.     public void displayProject() {
  116.         setContentView(R.layout.projectview_description);
  117.         displayMenu = true;
  118.         if(Build.VERSION.SDK_INT >= 11)
  119.             invalidateOptionsMenu(); // Rebuild the menu
  120.  
  121.         setTitle(project.getTitle());
  122.  
  123.         LinearLayout overlay = (LinearLayout) findViewById(R.id.projectview_description_overlay);
  124.         overlay.getBackground().setAlpha(127);
  125.  
  126.         if(project.getProject().getPictures().size() > 0) {
  127.             ImageView image = (ImageView) findViewById(R.id.projectview_description_image);
  128.             image.setImageBitmap(project.getProject().getPictures().get(0).getImageBitmap());
  129.         }
  130.  
  131.         TextView title = (TextView) findViewById(R.id.projectview_description_title);
  132.         title.setText(project.getTitle());
  133.  
  134.         TextView baseline = (TextView) findViewById(R.id.projectview_description_baseline);
  135.         baseline.setText(project.getBaseline());
  136.  
  137.         TextView website = (TextView) findViewById(R.id.projectview_description_website);
  138.         if("".equals(project.getProject().getWebsite()))
  139.             website.setVisibility(View.GONE);
  140.         else
  141.             website.setOnClickListener(this);
  142.  
  143.         if("".equals(project.getAboutSection())) {
  144.             LinearLayout aboutContainer = (LinearLayout) findViewById(R.id.projectview_description_about_container);
  145.             aboutContainer.setVisibility(View.GONE);
  146.         } else {
  147.             TextView aboutText = (TextView) findViewById(R.id.projectview_description_about_text);
  148.             aboutText.setText(project.getAboutSection());
  149.         }
  150.  
  151.         LinearLayout questions = (LinearLayout) findViewById(R.id.projectview_description_questions_container);
  152.         for(Question question : project.getProject().getQuestions()) {
  153.             if(question.getAnswer() != null) {
  154.                 LinearLayout questionLayout = (LinearLayout) getLayoutInflater().inflate(R.layout.projectview_question,null);
  155.  
  156.                 TextView questionView = (TextView) questionLayout.findViewById(R.id.projectview_question_question);
  157.                 TextView answerView = (TextView) questionLayout.findViewById(R.id.projectview_question_answer);
  158.  
  159.                 questionView.setText(question.getQuestion());
  160.                 answerView.setText(question.getAnswer().trim());
  161.  
  162.                 questions.addView(questionLayout);
  163.             }
  164.         }
  165.     }
  166.  
  167.     public void onClick(View arg0) {
  168.         Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(project.getProject().getWebsite()));
  169.         startActivity(intent);
  170.     }
  171. }
@H_301_2@感谢帮助！

解决方法

这是由于框架的缓存机制中的错误.最简单的解决方法是使用几乎为黑色的颜色,例如#ff010101.

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