监听android:drawableLeft和android:drawableRight点击事件

淡淡的烟草味﹌ 2023-10-17 19:11 2阅读 0赞

**监听android:drawableLeft和android:drawableRight点击事件**

Android官方没有提供对android:drawableLeft和android:drawableRight点击事件的监听，但有些情况下，如下面的搜索栏，

![20180417142112870][]

需要在用户输入字符点击左侧的搜索图标后触发搜索事件，而此搜索icon是通过android:drawableLeft添加的，此时就需要对android:drawableLeft上去的icon进行事件监听。我写了一个工具DrawableUtil类，对android:drawableLeft和android:drawableRight进行监听。

import android.graphics.drawable.Drawable;
    import android.view.MotionEvent;
    import android.view.View;
    import android.widget.TextView;
    
    public class DrawableUtil {
    
        /**
         * TextView四周drawable的序号。
         * 0 left,  1 top, 2 right, 3 bottom
         */
        private final int LEFT = 0;
        private final int RIGHT = 2;
    
        private OnDrawableListener listener;
        private TextView mTextView;
    
        public DrawableUtil(TextView textView, OnDrawableListener l) {
            mTextView = textView;
            mTextView.setOnTouchListener(mOnTouchListener);
            listener = l;
        }
    
        public interface OnDrawableListener {
            public void onLeft(View v, Drawable left);
    
            public void onRight(View v, Drawable right);
        }
    
        private View.OnTouchListener mOnTouchListener = new View.OnTouchListener() {
    
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_UP:
                        if (listener != null) {
                            Drawable drawableLeft = mTextView.getCompoundDrawables()[LEFT];
                            if (drawableLeft != null && event.getRawX() <= (mTextView.getLeft() + drawableLeft.getBounds().width())) {
                                listener.onLeft(v, drawableLeft);
                                return true;
                            }
    
                            Drawable drawableRight = mTextView.getCompoundDrawables()[RIGHT];
                            if (drawableRight != null && event.getRawX() >= (mTextView.getRight() - drawableRight.getBounds().width())) {
                                listener.onRight(v, drawableRight);
                                return true;
                            }
                        }
    
                        break;
                }
    
                return false;
            }
    
        };
    }

使用DrawableUtil，在构造时候传递一个OnDrawableListener即可完成监听，如：

import android.graphics.drawable.Drawable;
    import android.os.Bundle;
    import android.support.annotation.Nullable;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class DrawableActivity extends AppCompatActivity {
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.drawable_activity);
            TextView textView = findViewById(R.id.text);
    
            DrawableUtil drawableUtil = new DrawableUtil(textView, new DrawableUtil.OnDrawableListener() {
                @Override
                public void onLeft(View v, Drawable left) {
                    Toast.makeText(getApplicationContext(), "left", Toast.LENGTH_SHORT).show();
                }
    
                @Override
                public void onRight(View v, Drawable right) {
                    Toast.makeText(getApplicationContext(), "right", Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

注意要对xml布局中的TextView添加事件属性为true:

android:clickable="true"

[20180417142112870]: https://img-blog.csdn.net/20180417142112870