如何在Android中利用TextView实现自定义竖排-创新互联

这篇文章给大家介绍如何在Android中利用TextView实现自定义竖排，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

测试用的Activity。

public class MainActivity extends Activity implements OnTouchListener { 
 
  private VerticalTextView mVerticalTextView; 
 
  private TextView mTextView; 
 
  private int mTextCount; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(R.layout.activity_main); 
 
    mVerticalTextView = (VerticalTextView) findViewById(R.id.vertical_tv); 
    mTextView = (TextView) findViewById(R.id.content_tx); 
    mTextCount = mVerticalTextView.getText().length(); 
    mVerticalTextView.setOnTouchListener(this); 
    mTextView.setBackgroundColor(Color.LTGRAY); 
  } 
 
  @Override 
  public boolean onTouch(View v, MotionEvent event) { 
    float verticalTextViewHeight = mVerticalTextView.getHeight(); 
    float y = event.getY(); 
    int sectionPosition = (int) Math.ceil((y / verticalTextViewHeight) 
        / (1f / mTextCount)) - 1; 
    if (sectionPosition < 0) { 
      sectionPosition = 0; 
    } else if (sectionPosition >= mTextCount) { 
      sectionPosition = mTextCount - 1; 
    } 
    String sectionLetter = String.valueOf(mVerticalTextView.getText() 
        .charAt(sectionPosition)); 
    switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 
      mTextView.setVisibility(View.VISIBLE); 
      mTextView.setText(sectionLetter); 
      break; 
    case MotionEvent.ACTION_MOVE: 
      mTextView.setText(sectionLetter); 
      mTextView.setVisibility(View.VISIBLE); 
      break; 
 
    case MotionEvent.ACTION_UP: 
      mTextView.setVisibility(View.INVISIBLE); 
    default: 
      break; 
 
    } 
 
    return true; 
  } 
}