Question

我创建了一个简单的Navigation Drawer Activity和Basic Activity，我将其命名为LoginActivity，所以当我从抽屉中选择一个项目时，我能够导航到我的LoginActivity，但是没有BackButton在我的ActionBar中，我来自Xamarin Forms，在那里，根据导航类型，后退按钮是可见的！到目前为止，我有：

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar); ................

public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        Intent intent = new Intent(this,LoginActivity.class);
        startActivity(intent);

Android Studio 2.2.2
compileSdkVersion 24

Answer 1

在onCreate方法中更改此代码：

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.YOUR_NAVIGATION_ICON); //This is the line to add

此外，您可以确定点击此图标的功能：

 @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {

            case android.R.id.home:
                //Whatever your require the navigation to do
                return true;

        }
    }

如何在ActionBar AppCompatActivity Android Studio中创建后退按钮

1 个答案: