安卓自定义搜索控件

功能

搜索功能在app中无处不在，每次写布局文件也是特别的繁琐，因此我们直接在这自定义一个搜索控件，该控件不依赖其他的xml或者属性资源。

效果预览

代码预览

• SearchView.java

public class SearchView extends EditText {  //搜索图标的颜色(引用的是系统的搜索图标,默认设置为红色)  private int searchImgColor = Color.RED;  //背景圆角，单位dp  private int cornerRadius = 10;  private SearchViewChangeListener listener;  public SearchView(Context context) {    super(context);    init();  }  public SearchView(Context context, @Nullable AttributeSet attrs) {    super(context, attrs);    init();  }  public SearchView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    init();  }  private void init() {    initBackground();    initSearchImg();    addTextChangedListener(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 (listener != null) {          listener.onChange(SearchView.this,s.toString());        }      }    });  }  /**   * 初始化背景   */  private void initBackground() {    int backgroundColor = Color.GRAY;    Drawable drawable = getBackground();    if (drawable instanceof ColorDrawable) {      ColorDrawable colorDrawable = (ColorDrawable) drawable;      backgroundColor = colorDrawable.getColor();    }    GradientDrawable gradientDrawable = new GradientDrawable();    gradientDrawable.setCornerRadius(dp2px(cornerRadius));    gradientDrawable.setColor(backgroundColor);    setBackground(gradientDrawable);  }  /**   * 初始化搜索图标   */  private void initSearchImg() {    Drawable[] drawables = getCompoundDrawables();    if (drawables[0] == null) {      Drawable draw1 = this.getResources().getDrawable(android.R.drawable.ic_menu_search);      draw1.setColorFilter(searchImgColor, PorterDuff.Mode.SRC_IN);      draw1.setBounds(0, 0, draw1.getMinimumWidth(), draw1.getMinimumHeight());      setCompoundDrawables(draw1, null, null, null);    }  }  /**   * 设置搜索图标的颜色   *   * @param searchImgColor   */  public void setSearchImgColor(int searchImgColor) {    this.searchImgColor = searchImgColor;    postInvalidate();  }  public int dp2px(int dp) {    float density = getResources().getDisplayMetrics().density;    return (int) (dp * density + 0.5);  }  public void addSearchViewChangeListener(SearchViewChangeListener listener) {    this.listener = listener;  }  public interface SearchViewChangeListener {    void onChange(View view, String key);  }}

• activity_search.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:fitsSystemWindows="true"  android:orientation="vertical"  >  <com.wxx.phone.widget.SearchView    android:id="@+id/searchView1"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="默认的搜索"    android:padding="0dp"/>  <com.wxx.phone.widget.SearchView    android:id="@+id/searchView2"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_marginTop="10dp"    android:background="#cccccc"    android:hint="xml布局文件带背景色的搜索"    android:padding="6dp"/>  <com.wxx.phone.widget.SearchView    android:id="@+id/searchView3"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_marginTop="10dp"    android:background="#cccccc"    android:drawableLeft="@drawable/search"    android:hint="xml布局文件自定义搜索图标的"    android:padding="6dp"/></LinearLayout>

• SearchActivity.java

public class SearchActivity extends Activity {  private final String TAG=TestActivity.class.getSimpleName();  private SearchView searchView1, searchView2, searchView3;  private SearchViewChangeListener listener;  @Override  protected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_search);    searchView1 = (SearchView) findViewById(R.id.searchView1);    searchView2 = (SearchView) findViewById(R.id.searchView2);    searchView3 = (SearchView) findViewById(R.id.searchView3);    listener = new com.wxx.phone.widget.SearchView.SearchViewChangeListener() {      @Override      public void onChange(View view, String key) {        Log.e(TAG, view + "改变后的关键字>>>" + key);      }    };    searchView1.addSearchViewChangeListener(listener);    searchView2.addSearchViewChangeListener(listener);    searchView3.addSearchViewChangeListener(listener);  }}