《Android开发卷——实时监听文本框输入》
在实际开发中,有时候会让用户发布一些类似微博、说说的东西,但是这个是有限制长度的,除了在文本输入框限制长度外,还要在旁边有一条提示还能输入多少个字的“友好提示”。
1、文本框限制输入长度
2、安卓没有提供文本域,这里顺便提一下如果把textview制作成文本域。
<EditText android:id="@+id/push_edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#FFFFFF" android:hint="请输入你要发表的说说内容" android:maxLength="100" android:maxLines="6" android:minLines="6" android:textColor="#6C6C6C" android:textSize="12dp" > <requestFocus /> </EditText>
监听代码
public class MainActivity extends Activity { private EditText pushEdit; private TextView textNum; private Button btnSave,btnDelete; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pushEdit = (EditText)findViewById(R.id.push_edit); textNum = (TextView)findViewById(R.id.talk_personal_draftbox_num); btnSave = (Button)findViewById(R.id.push_ok); btnDelete = (Button)findViewById(R.id.push_delete); pushEdit.addTextChangedListener(textChange); btnSave.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getBaseContext(), "您提交的内容是:"+pushEdit.getText().toString(), Toast.LENGTH_LONG).show(); } }); btnDelete.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { pushEdit.setText(""); } }); } TextWatcher textChange = new TextWatcher(){ @Override public void afterTextChanged(Editable s) { if(pushEdit.length()<=100){ textNum.setText(100-pushEdit.length()+""); } } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { }}; }
项目源码:http://download.csdn.net/detail/chillax_li/6920963
尊重原创,转载请注明出处:http://blog.csdn.net/chillax_li/article/details/19177391