如何限制点之后的字符数(显示在我的 TextView 中) 看到 2 种方式会很棒:在 java 中,实际上在 TextView XML 中(如果可能的话)谢谢!
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    inivVars();     
}
private void inivVars(){...}
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch(v.getId()){
    case R.id.bCount:
        try{
        checkT1 = et1.getText().toString();
        checkT2 = et2.getText().toString();
        checkK1 = ek1.getText().toString();
        det1 = Float.parseFloat(checkT1);
        det2 = Float.parseFloat(checkT2);
        dek1 = Float.parseFloat(checkK1);
        float x = det2/(det1/100)/100*dek1;
        String sx = String.valueOf(x);
        text.setText(sx);
        text.setTextColor(Color.BLUE);
        }catch(Exception e){
            Toast t = Toast.makeText(CivilProtectActivity.this, "enter all values or use suitable '.'", Toast.LENGTH_LONG);
            t.show();
        }
        break;
    case R.id.bHide:
        InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(et1.getWindowToken(), 0);
        et1.setText("");
        et2.setText("");
        ek1.setText("");
        text.setText("");
        break;
    }}}
和显示数据的 TextView XML
 <TextView
    android:id="@+id/tvShowA"
    android:layout_width="95dp"
    android:layout_height="95dp"
    android:textSize="22dp"
    android:hint="X"
    android:background="@drawable/sun"
    android:gravity="center"
    />