Android開發中,使用 EditText 輸入內容,如何進行一鍵清空內容處理
阿新 • • 發佈:2018-12-23
本文僅為個人的處理方式,希望能對您有所幫助,歡迎各位留言指正,抱拳了
1、text.xml示例:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ccc">
< EditText
android:id="@+id/input"
android:layout_width="@dimen/dimen_270"
android:layout_height="wrap_content"
android:maxLines="1"
android:hint="請輸入內容"
android:textSize="@dimen/dimen_16"
android:textColor="@color/color_fff"
android:layout_marginTop= "@dimen/dimen_10" />
<ImageView
android:id="@+id/del"
android:layout_width="@dimen/dimen_14"
android:layout_height="@dimen/dimen_14"
android:visibility="gone"
android:layout_marginTop="@dimen/dimen_28"
android:src="@mipmap/bonus_envelope_cancel_icon_normal"
android:layout_toRightOf="@id/input"/>
</RelativeLayout>
2.textActivity.java示例:
public class textActivity extends Activity implements View.OnClickListener {
private EditText input;
private ImageView inputDel; //例項化一鍵清除輸入內容
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
initView();
initListener();
}
//對變數進行初始化
private void initView(){
inputDel = findViewById(R.id.del);
input = findViewById(R.id.input);
}
//設定監聽器
private void initListener(){
input.addTextChangedListener(textWatcher);
inputDel.setOnClickListener(this);
}
private TextWatcher textWatcher = new TextWatcher() {
@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) {
if (input.getEditableText().length() >= 1){
inputDel.setVisibility(View.VISIBLE);
} else{
inputDel.setVisibility(View.GONE);
}
}
};
//點選事件(清空)
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.del:
input.setText("");
break;
}
}
}
3、在AndroidManifest.xml中進行註冊:
<activity android:name=".textActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
4、效果圖如下:
動圖展示: