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  • Android Spinner In Toolbar

    As the title of the post suggest in this tutorial we will see how to have spinner widget inside the toolbar in the previous series of tutorial we have seen many example on how to set up the android spinner widget and also we have seen how to have android material design toolbar , in this tutorial we will see the combination of both .

    String Constant

    Lets have Array of string constant which will be set to spinner

    file : string.xml

    <resources>
    
    <string name="app_name">SpinnerToolbar</string>
    
    <string name="action_settings">Settings</string>
    
    <!-- Category -->
    
    <string-array name="category">
    
    <item>Top News</item>
    
    <item>Business</item>
    
    <item>Politics</item>
    
    <item>Sports</item>
    
    <item>Technology</item>
    
    <item>Movies</item>
    
    </string-array>
    
    </resources>
    XML Layout

    Create a layout/activity_main.xml file which contains Toolbar widget.

    file : 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"
    
    tools:context=".MainActivity">
    
    <android.support.v7.widget.Toolbar
    
    android:id="@+id/toolbar"
    
    android:layout_width="match_parent"
    
    android:layout_height="wrap_content"
    
    android:background="?attr/colorPrimary"
    
    android:minHeight="?attr/actionBarSize" />
    
    </LinearLayout>

    create a spinner_dropdown_item.xml which contains TextView which represents view for each items of spinner .

    file : spinner_dropdown_item.xml

    <?xml version="1.0" encoding="utf-8"?>
    
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
    
    android:id="@android:id/text1"
    
    android:layout_width="match_parent"
    
    android:layout_height="wrap_content"
    
    android:background="@color/colorPrimary"
    
    android:gravity="center_vertical"
    
    android:minHeight="?android:attr/listPreferredItemHeightSmall"
    
    android:paddingLeft="12dp"
    
    android:paddingRight="12dp"
    
    android:textAppearance="?android:attr/textAppearanceListItemSmall" />

     

    MainActivity

    Create a class MainActivity which extends AppCompatActivity , now inside onCreate() add spinner to toolbar dyanamically and also set onItemSelectListener.

    file : MainActivity.java

    package com.tutorialsbuzz.spinnertoolbar;
    
    import android.support.v7.app.ActionBarActivity;
    
    import android.os.Bundle;
    
    import android.support.v7.app.AppCompatActivity;
    
    import android.support.v7.widget.Toolbar;
    
    import android.view.View;
    
    import android.widget.AdapterView;
    
    import android.widget.ArrayAdapter;
    
    import android.widget.Spinner;
    
    import android.widget.SpinnerAdapter;
    
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
    
    private Toolbar toolbar=null;
    
    private String[] category=null;
    
    @Override
    
    protected void onCreate(Bundle savedInstanceState) {
    
    super.onCreate(savedInstanceState);
    
    setContentView(R.layout.activity_main);
    
    category = getResources().getStringArray(R.array.category);
    
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    
    setSupportActionBar(toolbar);
    
    getSupportActionBar().setDisplayShowTitleEnabled(false);
    
    toolbar.setLogo(R.drawable.ic_drawer);
    
    SpinnerAdapter spinnerAdapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.category, R.layout.spinner_dropdown_item);
    
    Spinner navigationSpinner = new Spinner(getSupportActionBar().getThemedContext());
    
    navigationSpinner.setAdapter(spinnerAdapter);
    
    toolbar.addView(navigationSpinner, 0);
    
    navigationSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    
    @Override
    
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    
    Toast.makeText(MainActivity.this,
    
    "you selected: " + category[position],
    
    Toast.LENGTH_SHORT).show();
    
    }
    
    @Override
    
    public void onNothingSelected(AdapterView<?> parent) {
    
    }
    
    });
    
    }
    
    }
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  • 原文地址:https://www.cnblogs.com/jasonkent27/p/5133396.html
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