android中操作栏标题左侧添加Icon [英] Add Icon to the left of the title in the action bar in android

问题描述

我想在操作栏中的标题左侧添加一个可点击的图标/按钮.怎么做?以下是我将搜索和设置图标添加到操作栏的代码.它们出现在右侧.但我想在标题左侧添加一个新图标.怎么做?XML :

I want to add a clickable icon/button to the left of the title in the action bar . How to do it? Following is the code with which I have added search and setting icon to the action bar. They appear on the right. But i want to add a new icon to the left of title. How to do it? XML :

    <menu xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        tools:context=".ui.home.activities.TransactionSearchActivity">

    <item
        android:id="@+id/action_search"
        android:icon="@android:drawable/ic_menu_search"
        android:title="search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="always" />

    <item android:id="@+id/action_setting"
        android:title="categories"
        android:icon="@drawable/icon_settings_h"
        app:showAsAction="always"
    />

主要活动

     @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_menu, menu);
        return true;
    }

推荐答案

推荐方式

getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_settings_24dp);// set drawable icon
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

处理图标点击事件

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(this, "click..!!", Toast.LENGTH_SHORT).show();
            return true;
        default:
            return super.onOptionsItemSelected(item);

    }
}

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