onOptionsItemSelected MenuItem View查找

项目中需要对toolbar右边的menu操作，发现点击的时候找不到menu中的view，在网上找了下资料才发现，需要在onCreateOptionsMenu中添加 super.onCreateOptionsMenu(menu)，然后在onOptionsItemSelected 中通过findViewById就可以找到menu布局中的view了。

<item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="always"/>

menu中的布局app:showAsAction必须是always,要不然还是为null。

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        View view = findViewById(R.id.action_settings);
        //这里的view在添加super.onCreateOptionsMenu(menu);后不为null了
        return true;
    }
    return super.onOptionsItemSelected(item);
}