TextWatcher监控EditText （转）

1. mainxml

[html] view plain copy print ?

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextViewandroid:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
android:ellipsize="marquee"
android:focusable="true"
android:marqueeRepeatLimit="marquee_forever"
android:focusableInTouchMode="true"
android:scrollHorizontally="true"
android:text="Pleaseinputthetext:"
/>
<EditTextandroid:id="@+id/ET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView  android:id="@+id/tv"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:textColor="@android:color/white"     android:ellipsize="marquee"     android:focusable="true"     android:marqueeRepeatLimit="marquee_forever"     android:focusableInTouchMode="true"     android:scrollHorizontally="true"        android:text="Please input the text:"    /><EditText android:id="@+id/ET"     android:layout_width="match_parent"     android:layout_height="wrap_content"    android:inputType="number"/></LinearLayout>

java代码：

[java] view plain copy print ?

packagecom.android.text;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.text.Editable;
importandroid.text.TextWatcher;
importandroid.util.Log;
importandroid.widget.EditText;
importandroid.widget.TextView;
importandroid.widget.Toast;
publicclassTextWatcherDemoextendsActivity{
privateTextViewmTextView;
privateEditTextmEditText;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView=(TextView)findViewById(R.id.tv);
mEditText=(EditText)findViewById(R.id.ET);
mEditText.addTextChangedListener(mTextWatcher);
}
TextWatchermTextWatcher=newTextWatcher(){
privateCharSequencetemp;
privateinteditStart;
privateinteditEnd;
@Override
publicvoidbeforeTextChanged(CharSequences,intarg1,intarg2,
intarg3){
temp=s;
}
@Override
publicvoidonTextChanged(CharSequences,intarg1,intarg2,
intarg3){
mTextView.setText(s);
}
@Override
publicvoidafterTextChanged(Editables){
editStart=mEditText.getSelectionStart();
editEnd=mEditText.getSelectionEnd();
if(temp.length()>10){
Toast.makeText(TextWatcherDemo.this,
"你输入的字数已经超过了限制！",Toast.LENGTH_SHORT)
.show();
s.delete(editStart-1,editEnd);
inttempSelection=editStart;
mEditText.setText(s);
mEditText.setSelection(tempSelection);
}
}
};
}

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