從Button onClick獲取TextView的值，並通過TextWatcher將值傳遞給TextView

Question

我希望我的應用程序執行的是計算平均值並將其顯示在TextView中。

我有兩個按鈕（button0和button1）和六個TextViews的佈局。當我按下其中一個按鈕時，我的應用程序將獲得按下的點擊次數以及與另一個按鈕相同的次數。而且它還可以獲得按下兩個按鈕的總點擊次數。因此，如果我按點擊次數來分按鈕0，按下總點擊次數，則按下兩個按鈕，然後將其乘以100，得到按下該按鈕的百分比點擊次數。

所以這是代碼：

Button button0, button1; 
    int click_button0, click_button1; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    View view = inflater.inflate(R.layout.fragment_fragment1, container, false); 

    final TextView times_0_tv = (TextView) view.findViewById(R.id.times_0); 
    final TextView percentage_0_tv = (TextView) view.findViewById(R.id.percentage_0); 
    final TextView times_1_tv = (TextView) view.findViewById(R.id.times_1); 
    final TextView percentage_1_tv = (TextView) view.findViewById(R.id.percentage_1); 
    final TextView total_clicks_tv = (TextView) view.findViewById(R.id.total_clicks); 

    button0 = (Button) view.findViewById(R.id.button0); 
    button1 = (Button) view.findViewById(R.id.button1); 

    button0.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      click_button0 = click_button0 + 1; 
      total_clicks = click_button0 + click_button1; 
      total_clicks_tv.setText(String.valueOf(total_clicks)); 

      if (click_button0 == 1) { 
       Toast.makeText(getActivity(), "Number 0 has apperared 1 time", Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(getActivity(), "Number 0 has apperared " + click_button0 + " times", Toast.LENGTH_SHORT).show(); 
      } 
      times_0_tv.setText(String.valueOf(click_button0)); 
      times_1_tv.setText(String.valueOf(click_button1)); 

     } 
    }); 

    button1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      click_button1 = click_button1 + 1; 
      total_clicks = click_button0 + click_button1; 
      total_clicks_tv.setText(String.valueOf(total_clicks)); 

      if (click_button1 == 1) { 
       Toast.makeText(getActivity(), "Number 1 has apperared 1 time", Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(getActivity(), "Number 1 has apperared " + click_button1 + " times", Toast.LENGTH_SHORT).show(); 
      } 
      times_0_tv.setText(String.valueOf(click_button0)); 
      times_1_tv.setText(String.valueOf(click_button1)); 

     } 
    }); 

    times_0_tv.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      String times0String = times_0_tv.getText().toString(); 
      String times1String = times_1_tv.getText().toString(); 
      String totaltimesString = total_clicks_tv.getText().toString(); 

      // convert the String into a double 
      if (times0String.length() > 0) { 
       click_button0 = (int) Double.parseDouble(times0String); 
      } 
      if (times1String.length() > 0) { 
       click_button1 = (int) Double.parseDouble(times1String); 
      } 
      if (totaltimesString.length() > 0) { 
       total_clicks = (int) Double.parseDouble(totaltimesString); 
      } 

      // calculate re 
      double percent0calc = calc_percent0(); 

      // set the label for re1Text 
      percentage_0_tv.setText(Double.toString(percent0calc)); 
     } 
    }); 

    times_1_tv.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      String times0String = times_0_tv.getText().toString(); 
      String times1String = times_1_tv.getText().toString(); 
      String totaltimesString = total_clicks_tv.getText().toString(); 

      // convert the String into a double 
      if (times0String.length() > 0) { 
       click_button0 = (int) Double.parseDouble(times0String); 
      } 
      if (times1String.length() > 0) { 
       click_button1 = (int) Double.parseDouble(times1String); 
      } 
      if (totaltimesString.length() > 0) { 
       total_clicks = (int) Double.parseDouble(totaltimesString); 
      } 

      // calculate re 
      double percent1calc = calc_percent1(); 

      // set the label for re1Text 
      percentage_1_tv.setText(Double.toString(percent1calc)); 
     } 
    }); 
} 

double calc_percent0() { 
    return click_button0/total_clicks; 
} 
double calc_percent1() { 
    return click_button1/total_clicks; 
} 

這裏是佈局的截圖：當我按下一個按鈕，這個比例是0％

問題就來了，它不會改變。這個想法是，例如，如果我按下button0 3次，button1 1次，0的百分比是75％，1的百分比是25％。任何想法都會受到歡迎，謝謝！

編輯：我已經刪除了TextWatcher的實現，並且我已經添加了一些代碼行。當我單擊button0時它工作正常，因爲它顯示點擊百分比是100％，但是當我點擊button1時，兩個百分比都變爲0，並且我沒有得到任何百分比。將總點擊的值傳遞給calc的百分比似乎存在問題。

這是現在的代碼爲片段：

Button button0, button1; 
int click_button0, click_button1; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 

View view = inflater.inflate(R.layout.fragment_fragment1, container, false); 

final TextView times_0_tv = (TextView) view.findViewById(R.id.times_0); 
    final TextView percentage_0_tv = (TextView) view.findViewById(R.id.percentage_0); 
    final TextView times_1_tv = (TextView) view.findViewById(R.id.times_1); 
    final TextView percentage_1_tv = (TextView) view.findViewById(R.id.percentage_1); 
    final TextView total_clicks_tv = (TextView) view.findViewById(R.id.total_clicks); 

    button0 = (Button) view.findViewById(R.id.button0); 
    button1 = (Button) view.findViewById(R.id.button1); 

    button0.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      click_button0 = click_button0 + 1; 
      total_clicks = click_button0 + click_button1; 
      total_clicks_tv.setText(String.valueOf(total_clicks)); 

      if (click_button0 == 1) { 
       Toast.makeText(getActivity(), "Number 0 has apperared 1 time", Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(getActivity(), "Number 0 has apperared " + click_button0 + " times", Toast.LENGTH_SHORT).show(); 
      } 
      times_0_tv.setText(String.valueOf(click_button0)); 
      times_1_tv.setText(String.valueOf(click_button1)); 
      percent0 = click_button0/total_clicks; 
      percentage_0_tv.setText(String.valueOf(percent0)); 
     } 
    }); 

    button1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      click_button1 = click_button1 + 1; 
      total_clicks = click_button0 + click_button1; 
      total_clicks_tv.setText(String.valueOf(total_clicks)); 

      if (click_button1 == 1) { 
       Toast.makeText(getActivity(), "Number 1 has apperared 1 time", Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(getActivity(), "Number 1 has apperared " + click_button1 + " times", Toast.LENGTH_SHORT).show(); 
      } 
      times_0_tv.setText(String.valueOf(click_button0)); 
      times_1_tv.setText(String.valueOf(click_button1)); 
      percent1 = click_button1/total_clicks; 
      percentage_1_tv.setText(String.valueOf(percent1)); 
     } 
    }); 
} 

Answer 1

你爲什麼不只是計算並設置按鈕的onClick的百分比是多少？您想要更新單擊按鈕時的百分比，因此邏輯應位於按鈕OnClickListener內，而不是TextWatcher。

此外，而不是從你的TextViews得到的值，使用已有的變量：int click_button0, click_button1;

使用變量的值是否在onclick的計算，然後設置TextViews值和預期它應該工作。另外，如果你打算嘗試和解析一個字符串作爲數字double，int等，你應該把它包含在try catch中以防異常。在這種情況下，您應該使用Integer.parseInt而不是使用parseDouble，然後將其轉換爲int。

編輯：啊，這是因爲你用int劃分int，所以結果也是int。一個快速解決方案是將其中一個數字轉換爲浮點數/雙精度數，並且當您分割時，您將得到一個十進制數。 ((double) click_button0)/total_clicks;

你也應該同時更新兩個百分比，看看一個數字的變化會影響另一個。