如何在更改seekbar android时更改textview的颜色？

Question

我使用seekbar来改变textview的颜色，但问题是在seekbar的特定位置点击时，textview颜色的其他位置没有改变。 如何解决这个问题？

在此先感谢。

这是代码。

public class SplashActivity extends Activity { 
private TextView textView; 
private SeekBar seekBar; 
int p = 0, noOfLength; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(R.layout.test); 
    textView = (TextView) findViewById(R.id.textView1); 
    seekBar = (SeekBar) findViewById(R.id.seekBar1); 
    textView.setText("Loading.Please wait...");// length of string is 22 
    String textLength = textView.getText().toString(); 
    noOfLength = textLength.length(); 
    seekBar.setMax(noOfLength); 
    seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 

     @Override 
     public void onStopTrackingTouch(SeekBar seekBar) { 
     } 

     @Override 
     public void onStartTrackingTouch(SeekBar seekBar) { 
     } 

     @Override 
     public void onProgressChanged(SeekBar seekBar, int progress, 
       boolean fromUser) { 
      try { 
       Spannable spannableString = new SpannableString(textView 
         .getText()); 
       if (progress > p) { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.YELLOW), 0, progress, 
          Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
        textView.setText(spannableString); 
       } else { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.GRAY), progress - 1, progress + 1, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE); 
        textView.setText(spannableString); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

     } 
    }); 

} 

}

当我不留，从开始到结束，从年底开始位置移动搜索条，它的工作原理，但是当我点击特定的位置搜索条，它不工作。

这是问题的截图：

Answer 1

如果你愿意单个字符颜色以颜色，而移动搜索条，然后把这个在onProgressChanged：如果你想

  try { 
       Spannable spannableString = new SpannableString(textView 
         .getText()); 
       if (progress > p) { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.YELLOW), progress-1, progress, 
          Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
        textView.setText(spannableString); 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.GRAY), 0, progress-1, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE); 
        textView.setText(spannableString); 
       } else { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.YELLOW), progress-1, progress, 
          Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
        textView.setText(spannableString); 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.GRAY), progress, noOfLength, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE); 
        textView.setText(spannableString); 
       } 

      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

或颜色所有字符然后试试这个：

 try { 
       Spannable spannableString = new SpannableString(textView 
         .getText()); 
       if (progress > p) { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.YELLOW), 0, progress, 
          Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
        textView.setText(spannableString); 
       } else { 
        p = progress; 
        spannableString.setSpan(new ForegroundColorSpan(
          Color.GRAY), progress - 1, noOfLength, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE); 
        textView.setText(spannableString); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      }