答案 0 :(得分:3)
如Michael Derazon在this post中所述,您可以扩展AutoCompleteTextView以包含自定义清除功能。实现将如下所示:
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AutoCompleteTextView;
/**
* sub class of {@link android.widget.AutoCompleteTextView} that includes a clear (dismiss / close) button with
* a OnClearListener to handle the event of clicking the button
* based on code from {@link http://www.gubed.net/clearableautocompletetextview}
* @author Michael Derazon
*
*/
public class ClearableAutoCompleteTextView extends AutoCompleteTextView {
// was the text just cleared?
boolean justCleared = false;
// if not set otherwise, the default clear listener clears the text in the
// text view
private OnClearListener defaultClearListener = new OnClearListener() {
@Override
public void onClear() {
ClearableAutoCompleteTextView et = ClearableAutoCompleteTextView.this;
et.setText("");
}
};
private OnClearListener onClearListener = defaultClearListener;
// The image we defined for the clear button
public Drawable imgClearButton = getResources().getDrawable(
R.drawable.abc_ic_clear_holo_light);
public interface OnClearListener {
void onClear();
}
/* Required methods, not used in this implementation */
public ClearableAutoCompleteTextView(Context context) {
super(context);
init();
}
/* Required methods, not used in this implementation */
public ClearableAutoCompleteTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
/* Required methods, not used in this implementation */
public ClearableAutoCompleteTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
void init() {
// Set the bounds of the button
this.setCompoundDrawablesWithIntrinsicBounds(null, null,
imgClearButton, null);
// if the clear button is pressed, fire up the handler. Otherwise do nothing
this.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
ClearableAutoCompleteTextView et = ClearableAutoCompleteTextView.this;
if (et.getCompoundDrawables()[2] == null)
return false;
if (event.getAction() != MotionEvent.ACTION_UP)
return false;
if (event.getX() > et.getWidth() - et.getPaddingRight() - imgClearButton.getIntrinsicWidth()) {
onClearListener.onClear();
justCleared = true;
}
return false;
}
});
}
public void setImgClearButton(Drawable imgClearButton) {
this.imgClearButton = imgClearButton;
}
public void setOnClearListener(final OnClearListener clearListener) {
this.onClearListener = clearListener;
}
public void hideClearButton() {
this.setCompoundDrawables(null, null, null, null);
}
public void showClearButton() {
this.setCompoundDrawablesWithIntrinsicBounds(null, null, imgClearButton, null);
}
}
有关如何实施该指南的完整指南,请参阅full post。结果如下图所示:
答案 1 :(得分:3)
试试这个:
activity_main.xml:
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:padding="5dp">
<AutoCompleteTextView
android:layout_marginTop="20dp"
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:hint="type here..."
android:dropDownWidth="300dp"/>
<Button
android:id="@+id/clear"
android:layout_width="23dp"
android:layout_height="23dp"
android:layout_marginRight="10dp"
android:layout_gravity="right|bottom"
android:layout_marginBottom="10dp"
android:background="@drawable/ic_close_black_24dp"
android:onClick="clear"/>
</FrameLayout>
MainActivity.java:
public class MainActivity extends AppCompatActivity {
AutoCompleteTextView text;
Button clear;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (AutoCompleteTextView) findViewById(R.id.text);
clear = (Button) findViewById(R.id.clear);
clear.setVisibility(View.INVISIBLE);
//close button visibility for manual typing
text.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
//do nothing
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//do nothing
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(s.length() != 0) {
clear.setVisibility(View.VISIBLE);
} else {
clear.setVisibility(View.GONE);
}
}
});
//sample array
String[] array = {"alpha", "beta", "cupcake", "donut", "eclair", "froyo", "gingerbread", "honeycomb", "icecreamsandwich", "jellybean", "kitkat", "lollipop", "marshmallow"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,array);
text.setThreshold(1); //will start working from first character
text.setAdapter(adapter); //setting the adapter data into the AutoCompleteTextView
//Shows drop down list on touch
text.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event){
text.showDropDown();
return false;
}
});
//close button visibility for autocomplete text view selection
text.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
clear.setVisibility(View.VISIBLE);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
clear.setVisibility(View.GONE);
}
});
}
public void clear(View view) {
text.setText("");
clear.setVisibility(View.GONE);
}
}
答案 2 :(得分:0)
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1">
<AutoCompleteTextView
android:id="@+id/desart"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="15sp" />
<ImageButton
android:id="@+id/clean"
android:layout_width="20dp"
android:layout_height="20dp"
android:adjustViewBounds="true"
android:layout_gravity="right|center_vertical"
android:background="@drawable/clean_state_button"
android:scaleType="center"/>
</FrameLayout>