<RelativeLayout
android:id="@+id/tab1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dip" >
<EditText
android:id="@+id/txtMarketName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:focusableInTouchMode="true"
android:textColor="@android:color/black"
android:textSize="17sp" />
<ImageView
android:id="@+id/imgDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dip"
android:focusableInTouchMode="true"
android:scaleType="fitXY"
android:src="@drawable/edit_clr_tab" />
</RelativeLayout>
xml 看起来像：
Java 代码：
public class EditTextLocker {
private EditText editText;
private int charactersLimit;
public EditTextLocker(EditText editText) {
this.editText = editText;
editText.setOnKeyListener(editTextOnKeyListener);
}
private OnKeyListener editTextOnKeyListener = new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL) {
startStopEditing(false);
}
return false;
}
};
private TextWatcher editTextWatcherForCharacterLimits = new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if (!editText.getText().toString().equalsIgnoreCase("")) {
int editTextLength = editText.getText().toString().trim()
.length();
if (editTextLength >= charactersLimit) {
startStopEditing(true);
}
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
};
public void limitCharacters(final int limit) {
this.charactersLimit = limit;
editText.addTextChangedListener(editTextWatcherForCharacterLimits);
}
public void unlockEditText() {
startStopEditing(false);
}
public void startStopEditing(boolean isLock) {
System.out.println("Start Stop Edit ==============> : " + isLock);
if (isLock) {
editText.setFilters(new InputFilter[] { new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend) {
return len < 1 ? dest.subSequence(dstart, dend)
: "";
}
} });
} else {
editText.setFilters(new InputFilter[] { new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start,
int end, Spanned dest, int dstart, int dend) {
return null;
}
} });
}
}
}
主要活动：
public class MainActivity extends Activity {
EditText editText1;
ImageView imageView1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText1 = (EditText) findViewById(R.id.txtMarketName);
imageView1 = (ImageView) findViewById(R.id.imgDelete);
final EditTextLocker locker1 = new EditTextLocker(editText1);
locker1.limitCharacters(60);
editText1.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
// TODO Auto-generated method stub
if (!hasFocus) {
imageView1.setVisibility(View.INVISIBLE);
} else {
imageView1.setVisibility(View.VISIBLE);
}
}
});
imageView1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
editText1.setText("");
}
});
}
}
问题是在 60 个字符后停止出现，但它仍然继续输入，除了文本没有出现，但是，它确实出现在“缓冲区”中（意思是建议的东西）
另一个问题是，在调用 imageview1 onClick 事件后，类型是继续，但文本不显示在编辑文本中