我想在我的应用程序中显示后退箭头按钮,但是当我将它放入我的代码时应用程序崩溃:
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
样式.xml
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">@color/PrimaryColor</item>
<item name="colorPrimaryDark">@color/PrimaryColorDark</item>
<item name="colorAccent">@color/PrimaryColor</item>
<item name="colorControlHighlight">@color/ControlHighlight</item>
<item name="android:statusBarColor" tools:targetApi="21">@android:color/transparent</item>
</style>
<style name="ActionBarPopupThemeOverlay" parent="ThemeOverlay.AppCompat.Light" >
<item name="android:textColor">#000000</item>
</style>
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabIndicatorColor">#FFFFFF</item>
<item name="tabIndicatorHeight">3dp</item>
<item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
<item name="android:textColor">#FFFFFF</item>
</style>
工具栏.xml
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="@dimen/abc_action_bar_default_height_material"
android:elevation="0dp"
android:layout_width="match_parent"
android:id="@+id/toolbar"
android:background="@color/PrimaryColor"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="@style/ActionBarPopupThemeOverlay"/>
类(不是片段):
public class WebViewCanale extends AppCompatActivity {
Toolbar toolbar;
TextView textView;
WebView webView;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview_canali);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
//Toolbar
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//FindViewById
webView = (WebView) findViewById(R.id.webview);
textView = (TextView) findViewById(R.id.textView);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
//Impostazioni WebView
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setLoadsImagesAutomatically(true);
webView.loadUrl(this.getIntent().getDataString());
webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webView.getSettings().setAppCacheEnabled(false);
//Titolo Toolbar
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
if (!TextUtils.isEmpty(title)) {
WebViewCanale.this.setTitle(title);
}
}
});
}
}