更改臨時按鈕的顏色

Question

我編寫了一個測驗，現在我希望每次按下正確的答案/按鈕（mButtonChoice）時按鈕的背景都會變成綠色，之後它將被設置爲默認值。

所以正確的按鈕應該是「彩色」綠色，然後像以前一樣。我該如何設法做到這一點？

QuizActicity（這裏是問題和選擇）： - 你應該習慣使用在線文檔您使用的組件

   @Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_quiz); 

    createDialog(); 
    Button dialogButton = (Button) findViewById(R.id.dialogbtn); 
    dialogButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      dialog.show(); 

     } 
    }); 

    closeButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      dialog.dismiss(); 
     } 
    }); 

    TextView shareTextView = (TextView) findViewById(R.id.share); 
    shareTextView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent myIntent = new Intent(Intent.ACTION_SEND); 
      myIntent.setType("text/plain"); 
      myIntent.putExtra(Intent.EXTRA_SUBJECT, "Hello!"); 
      myIntent.putExtra(Intent.EXTRA_TEXT, "My highscore in Quizzi is very high! I bet you can't beat me except you are cleverer than me. Download the app now!"); 
      startActivity(Intent.createChooser(myIntent, "Share with:")); 
     } 
    }); 

    mQuestionLibrary.shuffle(); 


    setSupportActionBar((Toolbar) findViewById(R.id.nav_action)); 
    DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); 
    mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.open, R.string.close); 
    mDrawerLayout.addDrawerListener(mToggle); 
    mToggle.syncState(); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); // Able to see the Navigation Burger "Button" 

    ((NavigationView) findViewById(R.id.nv1)).setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { 
     @Override 
     public boolean onNavigationItemSelected(MenuItem menuItem) { 
      switch (menuItem.getItemId()) { 
       case R.id.nav_stats: 
        startActivity(new Intent(QuizActivity.this, Menu2.class)); 
        break; 
       case R.id.nav_about: 
        startActivity(new Intent(QuizActivity.this, Menu3.class)); 
        break; 
      } 

      return true; 
     } 
    }); 

    mScoreView = (TextView) findViewById(R.id.score_score); 
    mQuestionView = (TextView) findViewById(R.id.question); 
    mButtonChoice1 = (Button) findViewById(R.id.choice1); 
    mButtonChoice2 = (Button) findViewById(R.id.choice2); 
    mButtonChoice3 = (Button) findViewById(R.id.choice3); 

    List<Button> choices = new ArrayList<>(); 
    choices.add(mButtonChoice1); 
    choices.add(mButtonChoice2); 
    choices.add(mButtonChoice3); 

    updateQuestion(); 

    for (final Button choice : choices) { 
     choice.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       if (choice.getText().equals(mAnswer)) { 

        updateScore(); 
        updateQuestion(); 

        Toast.makeText(QuizActivity.this, "Correct", Toast.LENGTH_SHORT).show(); 
       } else { 
        Toast.makeText(QuizActivity.this, "Wrong... Try again!", Toast.LENGTH_SHORT).show(); 

        Intent intent = new Intent(QuizActivity.this, Menu2.class); 
        intent.putExtra("score", mScore); // pass score to Menu2 
        startActivity(intent); 
       } 
      } 
     }); 
    } 

} 

private void updateQuestion() { 
    if (mQuestionNumber < mQuestionLibrary.getLength()) { 
     mQuestionView.setText(mQuestionLibrary.getQuestion(mQuestionNumber)); 
     mButtonChoice1.setText(mQuestionLibrary.getChoice1(mQuestionNumber)); 
     mButtonChoice2.setText(mQuestionLibrary.getChoice2(mQuestionNumber)); 
     mButtonChoice3.setText(mQuestionLibrary.getChoice3(mQuestionNumber)); 
     mAnswer = mQuestionLibrary.getCorrectAnswer(mQuestionNumber++); 
    } else { 
     Toast.makeText(QuizActivity.this, "Last Question! You are very intelligent!", Toast.LENGTH_SHORT).show(); 
     Intent intent = new Intent(QuizActivity.this, Menu2.class); 
     intent.putExtra("score", mScore); 
     startActivity(intent); 
    } 
} 

private void updateScore() { 
    mScoreView.setText(String.valueOf(++mScore)); 

    SharedPreferences mypref = getPreferences(MODE_PRIVATE); 
    int highScore = mypref.getInt("highScore", 0); 

    if (mScore > highScore) { 
     SharedPreferences.Editor editor = mypref.edit(); 
     editor.putInt("highScore", mScore); 
     editor.apply(); 
    } 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    return mToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item); 
} 

private void createDialog() { 
    dialog = new Dialog(this); 
    dialog.setTitle("Tutorial"); 
    dialog.setContentView(R.layout.popup_menu1_1); 
    closeButton = (TextView) dialog.findViewById(R.id.closeTXT); 
} 
    } 

Answer 1

作爲一個Java開發。

當你看機器人會Button類的API描述（https://developer.android.com/reference/android/widget/Button.html），你可能會發現，從機器人會繼承方法setBackgroundColor(int color)View類（https://developer.android.com/reference/android/view/View.html#setBackgroundColor(int)）

然後你只需要調用該方法在兩個正確的放置在您的程序中。

Answer 2

設置Button的「背景顏色」有點棘手。默認情況下，每個Button都有一個由Android系統管理的背景，其中包括諸如圓角，僅在特定區域內的顏色等。如果您只需致電setBackgroundColor()，則會失去所有這些複雜的行爲，並留下一個扁平的矩形。

我假設你在這裏從AppCompatActivity延伸。如果沒有，這個答案將無法正常工作。

要更改Button的背景顏色，同時仍保持了圓潤的造型及連鎖反應，使用ViewCompat.setBackgroundTintList()如下：

Button dialogButton = (Button) findViewById(R.id.dialogbtn); 
    int color = ContextCompat.getColor(this, R.color.yourColorResourceHere); 
    ColorStateList tintList = ColorStateList.valueOf(color); 
    ViewCompat.setBackgroundTintList(dialogButton, tintList);