有一个需求是这样的，页面上有一个输入框，供用户输入手机号码，如果通讯录里面存在这个号码，会自动把名字追加到号码后面。这个需求变态的地方在于，假如用一个EditText+TextView，那么不好控制二者之间的距离，就算是做了各种适配，但是用户可以设置系统的字体，仍然显示很难看！没办法，之好在一个EditText里面来做，让号码是可编辑的，名字是自动追加上的。
MainActivity.java：
public class MainActivity extends Activity {
private EditText edittext;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final View rootView = this.findViewById(R.id.rootview);
edittext = (EditText) this.findViewById(R.id.edittext1);
//限定只能输入数字
edittext.setInputType(EditorInfo.TYPE_CLASS_NUMBER);
//可以获取焦点
button = (Button)this.findViewById(R.id.button1);
button.setFocusable(true);
button.setFocusableInTouchMode(true);
// 空白处点击，隐藏软键盘
rootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
hideSoftInput();
}
});
// 一旦获取焦点，设置光标位置
edittext.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
String mobile = getMobile(edittext.getText().toString());
setCursorPosition(mobile.length());
}
}
});
// 返回true，手动处理touch事件，即使edittext获取了焦点，也不会自动弹出软键盘，要手动弹出
// http://*.com/questions/10263384/android-how-to-get-text-position-from-touch-event
edittext.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
Layout layout = ((EditText) v).getLayout();
float x = event.getX() + edittext.getScrollX();
int offset = layout.getOffsetForHorizontal(0, x);
if(offset >= 0 && offset < 11){
edittext.setSelection(offset);
}else if(offset >= 11){
edittext.setSelection(11);
}
showSoftInput();
}
return true;
}
});
edittext.addTextChangedListener(new TextWatcher() {
private String preText;
@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 mobile = getMobile(s.toString());
String nowtext = buildEditTextContent(mobile);
if (nowtext.equals(preText)) {
return;
}
// 计算当前的光标位置
int offset = calCursorOffset(preText, nowtext);
// 一定要在setTest之前设置preText，否则会*
preText = nowtext;
edittext.setText(nowtext);
// 文字发生变化，重新设置光标，否则会跑到最前面
setCursorPosition(offset);
if (mobile.length() == 11) {
hideSoftInput();
}
}
});
edittext.setText("15012341234");
}
private void hideSoftInput(){
edittext.requestFocus();
hideKeyboard();
button.requestFocus();
}
private void showSoftInput(){
edittext.requestFocus();
showKeyboard(edittext);
}
private void setCursorPosition(int offset){
edittext.setSelection(offset);
}
private String getMobile(String text){
if(text == null || text.length() <= 0){
return "";
}
String arr[] = text.split("\\s");
String mobile = arr[0];
return mobile;
}
private String buildEditTextContent(String mobile){
String name = getName(mobile);
String text = mobile + (name == null ? "" : " " + name);
return text;
}
private int calCursorOffset(String pre, String now){
if(isBlank(pre) && isBlank(now)){
return 0;
}else if(!isBlank(pre) && !isBlank(now)){
for(int i=0; i<pre.length() && i<now.length(); i++){
int prechar = pre.charAt(i);
int nowchar = now.charAt(i);
if(prechar != nowchar){
return i;
}
}
}
return now.length() > 11 ? 11 : now.length();
}
// 业务方法，联系人数据
private Map<String, String> data;
private String getName(String mobile) {
if (data == null) {
data = contactData();
}
return data.get(mobile);
}
private Map<String, String> contactData() {
Map<String, String> data = new HashMap<String, String>();
data.put("15012341234", "张三");
data.put("15112341234", "李四");
data.put("15212341234", "王五");
return data;
}
// util方法
public void showKeyboard(View focusView) {
Object showing = focusView.getTag();
if (showing != null) {
return;
}
try {
InputMethodManager imm = (InputMethodManager) this
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(focusView, 0);
focusView.setTag(new Object());
} catch (Exception e) {
Log.e("SoftInput:Showing had a wrong.", e.toString());
}
}
public void hideKeyboard() {
View focusView = this.getCurrentFocus();
if (focusView == null || focusView.getTag() == null) {
return;
}
try {
InputMethodManager imm = ((InputMethodManager) this
.getSystemService(Activity.INPUT_METHOD_SERVICE));
imm.hideSoftInputFromWindow(focusView.getWindowToken(),
InputMethodManager.HIDE_NOT_ALWAYS);
focusView.setTag(null);
} catch (Exception e) {
Log.e("SoftInput:Hiding had a wrong.", e.toString());
}
}
public boolean isBlank(String str){
if(str == null || str.length() <= 0){
return true;
}
return false;
}
}activity_main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/rootview">
<EditText
android:id="@+id/edittext1"
android:layout_width="300dp"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="0dp"/>
</LinearLayout>
此外，为了防止在进入页面的时候自动弹出软键盘，可以在manifest的activity元素添加<activity android:windowSoftInputMode="stateAlwaysHidden|adjustPan">