androidx使用Toolbar

將默認標題欄改為隱藏狀態

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<resources>

????<!-- Base application theme. -->
????<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
????????<!-- Customize your theme here. -->
????????<item name="colorPrimary">@color/colorPrimary</item>
????????<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
????????<item name="colorAccent">@color/colorAccent</item>
????</style>

</resources>

2.修改默認布局文件代碼

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
????android:layout_width="match_parent"
????android:layout_height="match_parent"
????tools:context=".MainActivity">


????<androidx.appcompat.widget.Toolbar
????????android:id="@+id/toolbar"
????????android:layout_width="match_parent"
????????android:layout_height="50dp"
????????android:background="@color/colorPrimary"
????????tools:ignore="MissingConstraints">
????</androidx.appcompat.widget.Toolbar>



</androidx.constraintlayout.widget.ConstraintLayout>

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3.在res目錄下創建menu文件夾，然后在menu文件夾下創建toolbar.xml

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4.修改toolbar.xml文件里的內容為

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
??????xmlns:app="http://schemas.android.com/apk/res-auto">
??????<item
??????????android:id="@+id/backup"
??????????android:title="BackUp"
??????????android:icon="@drawable/d27"
??????????app:showAsAction="always" />
????<item
????????android:id="@+id/backup1"
????????android:title="BackUp"
????????android:icon="@drawable/d27"
????????app:showAsAction="always" />
????<item
????????android:id="@+id/backup2"
????????android:title="BackUp"
????????android:icon="@drawable/d27"
????????app:showAsAction="always" />


</menu>

5.修改MainActivity內代碼

package com.example.meterial;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import androidx.appcompat.widget.Toolbar;

public class MainActivity extends AppCompatActivity {

????@Override
????protected void onCreate(Bundle savedInstanceState) {
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);
????????Toolbar toolbar=(Toolbar) findViewById(R.id.toolbar);
????????setSupportActionBar(toolbar);
????}

????@Override
????public boolean onCreateOptionsMenu(Menu menu) {
????????getMenuInflater().inflate(R.menu.toolbar,menu);
????????return true;
????}

????@Override
????public boolean onOptionsItemSelected(MenuItem item) {
????????switch (item.getItemId()){
????????????case R.id.backup:
????????????????Toast.makeText(this,"點擊了第一個按鈕",Toast.LENGTH_LONG).show();
????????????????break;
????????????case ?R.id.backup1:
????????????????Toast.makeText(this,"點擊了第二個按鈕",Toast.LENGTH_LONG).show();
????????????????break;
????????????case ?R.id.backup2:
????????????????Toast.makeText(this,"點擊了第三個按鈕",Toast.LENGTH_LONG).show();
????????????????break;
????????}
????????return true;
????}
}

6.最后效果

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總結

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