[Android] text box for search and clearing

 

Preface

Result of this article: when the input text box is empty, the input icon is displayed. If it is not empty, the empty icon is displayed. Click the clear icon to clear the input text in the text box.

 

Statement

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Body

I. Implementation results

　　　　

　　　　　　　

 

II. Implementation Code

Listener Input

/**
* Dynamic search
*/
Private TextWatcher tbxSearch_TextChanged = new TextWatcher (){

// Whether the last cached text box is empty
Private boolean isnull = true;

@ Override
Public void afterTextChanged (Editable s ){
If (TextUtils. isEmpty (s )){
If (! Isnull ){
MSearchView. setCompoundDrawablesWithIntrinsicBounds (null,
Null, mIconSearchDefault, null );
Isnull = true;
}
} Else {
If (isnull ){
MSearchView. setCompoundDrawablesWithIntrinsicBounds (null,
Null, mIconSearchClear, null );
Isnull = false;
}
}
}

@ Override
Public void beforeTextChanged (CharSequence s, int start, int count,
Int after ){
}

/**
* The list content is dynamically changed as the text box Content Changes
*/
@ Override
Public void onTextChanged (CharSequence s, int start, int before,
Int count ){

}
};

Touch event

Private OnTouchListener txtSearch_OnTouch = new OnTouchListener (){
@ Override
Public boolean onTouch (View v, MotionEvent event ){
Switch (event. getAction ()){
Case MotionEvent. ACTION_UP:
Int curX = (int) event. getX ();
If (curX> v. getWidth ()-38
&&! TextUtils. isEmpty (mSearchView. getText ())){
MSearchView. setText ("");
Int cacheInputType = mSearchView. getInputType (); // backup the input type
MSearchView. setInputType (InputType. TYPE_NULL); // disable soft input
MSearchView. onTouchEvent (event); // call native handler
MSearchView. setInputType (cacheInputType); // restore input type
Return true; // consume touch even
}
Break;
}
Return false;
}
};

Bind event

Private Drawable mIconSearchDefault; // default icon of the search text box
Private Drawable mIconSearchClear; // clear text content icon in the search text box

@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. main)

Final Resources res = getResources ();
MIconSearchDefault = res.getDrawable(R.drawable.txt _ search_default );
MIconSearchClear = res.getDrawable(R.drawable.txt _ search_clear );

MSearchView = (EditText) findViewById(R.id.txt Search );
MSearchView. addTextChangedListener (tbxSearch_TextChanged );
MSearchView. setOnTouchListener (txtSearch_OnTouch );
}

Code Description:

1. Bind a touch event to the input box (simulate Click Event capture ). You can check whether the image is cleared by monitoring the click area. If the image is in this area and the text box is not empty, the text box is cleared.

2. Bind a text change event listener to the input box and dynamically set the icon Display Based on the content changes.

3. Maintain the soft keyboard status after the clear operation.

 

Iii. References

1. how to block virtual keyboard while clicking on edittext in android?

 

4. Downloading small icons

　　　　　　

(Right-click and save .)

 

End

Using the attributes, methods, and events of each control can achieve many interesting effects. Welcome to your discussion.