最初のボタンは、アプリケーションを再開した後にのみ表示されます

Question

私は既にこの質問をスタックオーバーフローでいくつか聞いていますが、私はこの時間は私に正しいコードを表示することができます願っています。 コーディングは：

public class MainActivity extends AppCompatActivity { 

Toolbar mToolbar; 
Button mRedColor; 
Button mGreenColor; 
Button mYellowColor; 
Button[] b=new Button[2]; 
SharedPreferences mSharedPreferences; 
SharedPreferences.Editor edit; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
mSharedPreferences = getSharedPreferences("ButtonColor", MODE_PRIVATE); 
edit = getSharedPreferences("ButtonColor", MODE_PRIVATE).edit(); 
mToolbar = (Toolbar) findViewById(R.id.toolbar); 
final Button[] b = new Button[]{(Button) findViewById(R.id.btnRed), 
     (Button) findViewById(R.id.btnGreen), 
     (Button) findViewById(R.id.btnYellow),}; 

mToolbar.setTitle(getResources().getString(R.string.app_name)); 

if (getColor() != getResources().getColor(R.color.colorPrimary)) { 
     for (int i = 0 ; i<b.length; i++){ 

      if(b[i].equals(b[0])){ 

      b[0].setBackgroundColor(getColor()); 
      b[i].setEnabled(false); 

      } 
      else if (b[i].equals(b[1])){ 

        b[1].setBackgroundColor(getColor()); 
        b[i].setEnabled(false); 
      }else if (b[i].equals(b[2])){ 

       b[2].setBackgroundColor(getColor()); 
       b[i].setEnabled(false); 
      } 

     } 
} 

for (int i = 0; i < b.length; i++) { 

    b[i].setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 
      switch (view.getId()) //so we get its id here 
      { 
       case (R.id.btnRed): 
        b[0].setBackgroundColor(getResources().getColor(R.color.colorRed)); 
        storeColor(getResources().getColor(R.color.colorRed)); 
        b[0].setEnabled(false); 

        break; 
       case (R.id.btnGreen): 
        b[1].setBackgroundColor(getResources().getColor(R.color.colorGreen)); 
        storeColor(getResources().getColor(R.color.colorGreen)); 
        b[1].setEnabled(false); 
        break; 
       case (R.id.btnYellow): 
        b[2].setBackgroundColor(getResources().getColor(R.color.colorYellow)); 
        storeColor(getResources().getColor(R.color.colorYellow)); 
        b[2].setEnabled(false); 
        break; 
      } 
     } 
    }); 
    } 
    } 
@Override 
protected void onResume() { 
super.onResume(); 
mSharedPreferences = getSharedPreferences("ButtonColor", MODE_PRIVATE); 
edit=getSharedPreferences("ButtonColor", MODE_PRIVATE).edit(); 
} 

@Override 
public void onStop() { 
super.onStop(); 
} 
private void storeColor(int color){ 
SharedPreferences mSharedPreferences = 
getSharedPreferences("ButtonColor", MODE_PRIVATE); 
SharedPreferences.Editor mEditor = mSharedPreferences.edit(); 
mEditor.putInt("color", color); 
mEditor.apply(); 
} 
private int getColor(){ 
SharedPreferences mSharedPreferences = 
getSharedPreferences("ButtonColor", MODE_PRIVATE); 
int selectedColor = mSharedPreferences.getInt("color", 
getResources().getColor(R.color.colorPrimary)); 
return selectedColor; 
} 
} 

私が直面している問題はここにある：The first Button only will be coloured permanently after reopen application ......、ありがとう

Answer 1

コードの下に試してみてください。すべてのボタンの色を変更できますが、最後に選択したボタンの色のみが保存されます。

 public class MainActivity extends AppCompatActivity { 
     Toolbar mToolbar; 
     Button mRedColor; 
     Button mGreenColor; 
     Button mYellowColor; 
     Button[] b = new Button[2]; 
SharedPreferences mSharedPreferences; 
SharedPreferences.Editor edit; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_color); 
    mSharedPreferences = getSharedPreferences("ButtonColor", MODE_PRIVATE); 
    edit = getSharedPreferences("ButtonColor", MODE_PRIVATE).edit(); 
    mToolbar = (Toolbar) findViewById(R.id.toolbar); 
    final Button[] b = new Button[]{(Button) findViewById(R.id.btnRed), 
      (Button) findViewById(R.id.btnGreen), 
      (Button) findViewById(R.id.btnYellow),}; 

    mToolbar.setTitle(getResources().getString(R.string.app_name)); 
    int lastPostion = getButtonPosition(); 
    if (getColor() != getResources().getColor(R.color.colorPrimary)) { 
     for (int i = 0; i < b.length; i++) { 

      if (b[i].equals(b[0]) && i == lastPostion) { 

       b[0].setBackgroundColor(getColor()); 
       b[i].setEnabled(false); 

      } else if (b[i].equals(b[1]) && i == lastPostion) { 

       b[1].setBackgroundColor(getColor()); 
       b[i].setEnabled(false); 

      } else if (b[i].equals(b[2]) && i == lastPostion) { 

       b[2].setBackgroundColor(getColor()); 
       b[i].setEnabled(false); 


      } 

     } 
    } 

    for (int i = 0; i < b.length; i++) { 

     b[i].setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View view) { 
       switch (view.getId()) //so we get its id here 
       { 
        case (R.id.btnRed): 
         b[0].setBackgroundColor(getResources().getColor(android.R.color.holo_red_dark)); 
         storeColor(getResources().getColor(android.R.color.holo_red_dark), 0); 
         b[0].setEnabled(false); 

         break; 
        case (R.id.btnGreen): 
         b[1].setBackgroundColor(getResources().getColor(android.R.color.holo_green_dark)); 
         storeColor(getResources().getColor(android.R.color.holo_green_dark), 1); 
         b[1].setEnabled(false); 
         break; 
        case (R.id.btnYellow): 
         b[2].setBackgroundColor(getResources().getColor(android.R.color.black)); 
         storeColor(getResources().getColor(android.R.color.black), 2); 
         b[2].setEnabled(false); 
         break; 
       } 
      } 
     }); 
    } 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    mSharedPreferences = getSharedPreferences("ButtonColor", MODE_PRIVATE); 
    edit = getSharedPreferences("ButtonColor", MODE_PRIVATE).edit(); 
} 

@Override 
public void onStop() { 
    super.onStop(); 
} 

private void storeColor(int color, int position) { 
    SharedPreferences mSharedPreferences = 
      getSharedPreferences("ButtonColor", MODE_PRIVATE); 
    SharedPreferences.Editor mEditor = mSharedPreferences.edit(); 
    mEditor.putInt("color", color); 
    mEditor.putInt("position", position); 
    mEditor.apply(); 
} 

private int getColor() { 
    SharedPreferences mSharedPreferences = 
      getSharedPreferences("ButtonColor", MODE_PRIVATE); 
    int selectedColor = mSharedPreferences.getInt("color", 
      getResources().getColor(R.color.colorPrimary)); 
    return selectedColor; 
} 

private int getButtonPosition() { 
    SharedPreferences mSharedPreferences = 
      getSharedPreferences("ButtonColor", MODE_PRIVATE); 
    int selectedColor = mSharedPreferences.getInt("position", 0); 
    return selectedColor; 
} 

}