Android标题栏添加返回按钮-蒲公英云

Android标题栏添加返回按钮

1、xml文件布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!-- 采用灵活性高的Toolbar替换ActionBar -->
    <androidx.appcompat.widget.Toolbar
        android:id="@+id/tb_register_back"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
</LinearLayout>

2、Activity中具体的调用代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_register);
      //初始标题栏
      Toolbar toolbar= findViewById(R.id.tb_register_back);
      setSupportActionBar(toolbar);
      //显示返回按钮
      ActionBar actionBar = getSupportActionBar();
      if (actionBar != null) {
          actionBar.setHomeButtonEnabled(true);
          actionBar.setDisplayHomeAsUpEnabled(true);
      }
}
/**
  * 监听标题栏按钮点击事件.
  * @param item 按钮
  * @return 结果
  */
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    //返回按钮点击事件
    if (item.getItemId() == android.R.id.home) {
        finish();
        return true;
    }
    return super.onOptionsItemSelected(item);
}

3、在AndroidManifest.xml中指定anroid:theme=”@style/AppTheme”

4、在res/values/styles.xml中定义AppTheme主题：

<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>