EditText 获得焦点时hint消失，失去焦点时hint显示

android 默认状态时输入文字后hint消失，在此实现的是点击EditText时，也就是获得焦点的时候hint就会消失。

以下为代码

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="horizontal" >    <EditText        android:id="@+id/editText1"        android:layout_width="50dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:ems="10"        android:hint="@string/app_name"        android:inputType="number" >        <requestFocus />    </EditText>    <EditText        android:id="@+id/editText2"        android:layout_width="50dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:ems="10"        android:hint="@string/app_name"        android:inputType="number" />    <EditText        android:id="@+id/editText3"        android:layout_width="50dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:ems="10"        android:hint="@string/app_name"        android:inputType="number" />    <EditText        android:id="@+id/editText4"        android:layout_width="50dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:ems="10"        android:hint="@string/app_name"        android:inputType="number" /> </LinearLayout>

以下为MainActivity.java

package com.chuanchuan.edittextdemo;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.View;import android.view.View.OnFocusChangeListener;import android.widget.EditText;import android.widget.TextView;import android.app.Activity;public class MainActivity extends Activity {private EditText et1;private EditText et2;private EditText et3;private EditText et4;String strHint;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);et1=(EditText) findViewById(R.id.editText1);et2=(EditText) findViewById(R.id.editText2);et3=(EditText) findViewById(R.id.editText3);et4=(EditText) findViewById(R.id.editText4);strHint=getResources().getString(R.string.app_name);final EditText[] mArray = new EditText[] { et1,et2, et3, et4 };for (int i = 0; i < mArray.length; i++) {final int j = i;//EditText 获得焦点时hint消失，失去焦点时hint显示mArray[j].setOnFocusChangeListener(new OnFocusChangeListener() {@Overridepublic void onFocusChange(View v, boolean hasFocus) {        if (!hasFocus) {        ((TextView) v).setHint(strHint);        } else {        ((TextView) v).setHint("");        }}});mArray[j].addTextChangedListener(new TextWatcher() {private CharSequence temp;private int sStart;private int sEnd;@Overridepublic void onTextChanged(CharSequence s, int start,int before, int count) {temp = s;}@Overridepublic void beforeTextChanged(CharSequence s, int start,int count, int after) {}@Overridepublic void afterTextChanged(Editable s) {sStart = mArray[j].getSelectionStart();sEnd = mArray[j].getSelectionEnd();//前三个EditText输入满位（此处设置 为3）后，光标自动移到下一个TextViewif (temp.length() == 3 && (j == 0 || j == 1 || j == 2)) {mArray[j + 1].setFocusable(true);mArray[j + 1].setFocusableInTouchMode(true);mArray[j + 1].requestFocus();}//输入超出三位时，删除多出的一位if (temp.length() > 3) {s.delete(sStart - 1, sEnd);int tSelection = sStart;mArray[j].setText(s);mArray[j].setSelection(tSelection);}}});}}}