自定義EditText實現類iOS風格搜尋框
阿新 • • 發佈:2019-02-05
最近在專案中有使用到搜尋框的地方,由於其樣式要求與iOS的UISearchBar的風格一致。預設情況下,搜尋圖示和文字是居中的,在獲取焦點的時候,圖示和文字左移。但是在Android是並沒有這樣的控制元件(可能見識少,並不知道有)。通常情況下我們使用組合控制元件,使用ReleativeLayout或者FrameLayout來實現。此篇並不是使用上述方法實現,其核心是繼承系統EditText,重寫onDraw方法,來改變預設的左上右下的drawable,實現平移到中間位置。這裡暫時只實現了drawableLeft的情況,後續將對其進行更新。先來看看實現效果圖:
直接來看程式碼實現
package com.jinlin.custom.iconcenterview;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends BaseActivity{
private EditText et_search;
private IconCenterEditText icet_search;
@Override
public void iniView() {
setContentView(R.layout.activity_main);
et_search = (EditText) findViewById(R.id.et_search);
icet_search = (IconCenterEditText) findViewById(R.id.icet_search);
// 實現TextWatcher監聽即可
icet_search.setOnSearchClickListener(new IconCenterEditText.OnSearchClickListener() {
@Override
public void onSearchClick(View view) {
Toast.makeText(MainActivity.this, "i'm going to seach", Toast.LENGTH_SHORT).show();
}
});
}
}
這是主Activity的程式碼,其繼承自BaseActivity基類,BaseActivity的實現詳細見上篇博文Android點選空白區域,隱藏輸入法軟鍵盤只是在isShouldHideKeyboard(View v, MotionEvent event)方法內部增加一行v.clearFocus();程式碼進行去除焦點處理,其他均一致。
private boolean isShouldHideKeyboard(View v, MotionEvent event) {
if (v != null && (v instanceof EditText)) {
int[] l = {0, 0};
v.getLocationInWindow(l);
int left = l[0],
top = l[1],
bottom = top + v.getHeight(),
right = left + v.getWidth();
if (event.getX() > left && event.getX() < right
&& event.getY() > top && event.getY() < bottom) {
// 點選EditText的事件,忽略它。
return false;
} else {
v.clearFocus();
return true;
}
}
// 如果焦點不是EditText則忽略,這個發生在檢視剛繪製完,第一個焦點不在EditText上,和使用者用軌跡球選擇其他的焦點
return false;
}
接下來是自定義View的程式碼實現
IconCenterEditText.java
package com.jinlin.custom.iconcenterview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
/**
* Created by J!nl!n on 2015/1/26.
*/
public class IconCenterEditText extends EditText implements View.OnFocusChangeListener, View.OnKeyListener {
private static final String TAG = IconCenterEditText.class.getSimpleName();
/**
* 是否是預設圖示再左邊的樣式
*/
private boolean isLeft = false;
/**
* 是否點選軟鍵盤搜尋
*/
private boolean pressSearch = false;
/**
* 軟鍵盤搜尋鍵監聽
*/
private OnSearchClickListener listener;
public void setOnSearchClickListener(OnSearchClickListener listener) {
this.listener = listener;
}
public IconCenterEditText(Context context) {
this(context, null);
init();
}
public IconCenterEditText(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.editTextStyle);
init();
}
public IconCenterEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
setOnFocusChangeListener(this);
setOnKeyListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
if (isLeft) { // 如果是預設樣式,則直接繪製
super.onDraw(canvas);
} else { // 如果不是預設樣式,需要將圖示繪製在中間
Drawable[] drawables = getCompoundDrawables();
if (drawables != null) {
Drawable drawableLeft = drawables[0];
if (drawableLeft != null) {
float textWidth = getPaint().measureText(getHint().toString());
int drawablePadding = getCompoundDrawablePadding();
int drawableWidth = drawableLeft.getIntrinsicWidth();
float bodyWidth = textWidth + drawableWidth + drawablePadding;
canvas.translate((getWidth() - bodyWidth - getPaddingLeft() - getPaddingRight()) / 2, 0);
}
}
super.onDraw(canvas);
}
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
Log.d(TAG, "onFocusChange execute");
// 恢復EditText預設的樣式
if (!pressSearch && TextUtils.isEmpty(getText().toString())) {
isLeft = hasFocus;
}
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
pressSearch = (keyCode == KeyEvent.KEYCODE_ENTER);
if (pressSearch && listener != null) {
/*隱藏軟鍵盤*/
InputMethodManager imm = (InputMethodManager) v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm.isActive()) {
imm.hideSoftInputFromWindow(v.getApplicationWindowToken(), 0);
}
listener.onSearchClick(v);
}
return false;
}
public interface OnSearchClickListener {
void onSearchClick(View view);
}
}
此View重寫onDraw(Canvas canvas)方法,並實現OnFocusChangeListener, OnKeyListener監聽介面,在onFocusChange(View v, boolean hasFocus)方法判斷是否需要恢復樣式,然後在onDraw(Canvas canvas)進行重繪,實現焦點失去和獲取時,平移圖示和文字。同時還會判斷軟鍵盤搜尋鍵的操作進行處理。其核心程式碼也就是一下這一小段:
Drawable[] drawables = getCompoundDrawables();
if (drawables != null) {
Drawable drawableLeft = drawables[0];
if (drawableLeft != null) {
float textWidth = getPaint().measureText(getHint().toString());
int drawablePadding = getCompoundDrawablePadding();
int drawableWidth = drawableLeft.getIntrinsicWidth();
float bodyWidth = textWidth + drawableWidth + drawablePadding;
canvas.translate((getWidth() - bodyWidth - getPaddingLeft() - getPaddingRight()) / 2, 0);
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusableInTouchMode="true"
android:orientation="vertical"
android:padding="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
style="@style/StyleTextView"
android:text="預設樣式" />
<EditText
android:id="@+id/et_search"
style="@style/StyleEditText" />
<TextView
style="@style/StyleTextView"
android:text="居中樣式" />
<com.jinlin.custom.iconcenterview.IconCenterEditText
android:id="@+id/icet_search"
style="@style/StyleEditText" />
</LinearLayout>
bg_search_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/white" />
<stroke
android:width="1px"
android:color="@android:color/darker_gray" />
<corners android:radius="3dp" />
</shape>
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
<style name="StyleEditText">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:background">@drawable/bg_search_bar</item>
<item name="android:drawablePadding">5dp</item>
<item name="android:drawableStart">@mipmap/icon_search</item>
<item name="android:gravity">center_vertical</item>
<item name="android:imeOptions">actionSearch</item>
<item name="android:padding">5dp</item>
<item name="android:singleLine">true</item>
<item name="android:textColorHint">@color/gray_white</item>
<item name="android:textSize">16sp</item>
<item name="android:hint">搜尋</item>
</style>
<style name="StyleTextView">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">40dp</item>
<item name="android:gravity">center</item>
<item name="android:textSize">20sp</item>
</style>
</resources>
colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="gray_white">#ffcccccc</color>
</resources>