[英]Custom ActionBar is not showing
I'm beginner in android development.. I don't know where is the problem.. 我是android开发的初学者..我不知道问题出在哪里..
The activity does not show custom actionbar... i tried it by watching a tutorial.. pls give some solution.. thanks in advance.. 活动没有显示自定义操作栏...我通过观看教程尝试了..请给出一些解决方案..提前感谢..
actoin_bar.xml actoin_bar.xml
` `
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="36dp"
android:background="#009688" >
<TextView
android:id="@+id/title_text_small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff"
android:textStyle="bold" />
<ImageView
android:id="@+id/forward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"
android:src="@drawable/ic_action_name"
android:layout_margin="8dp"
android:layout_toLeftOf="@+id/refresh"
android:layout_toStartOf="@+id/refresh"
android:contentDescription="@string/tabb" />
<ImageView
android:id="@+id/backward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"
android:layout_margin="8dp"
android:src="@drawable/ic_action_backward"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@+id/forward"
android:layout_toStartOf="@+id/forward"
/>
<ImageView
android:id="@+id/refresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"
android:src="@drawable/ic_action_reload"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="6dp"
android:layout_marginBottom="6dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="16dp" />
</RelativeLayout>
` `
subtitle.java subtitle.java
import android.app.Activity;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.DownloadListener;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class Subtitle extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_subtitle);
ActionBar mActionBar;
mActionBar = getSupportActionBar();
if (mActionBar != null) {
getSupportActionBar().setCustomView(R.layout.action_bar);
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
TextView mTitleTextView = null;
if (mActionBar != null) {
mTitleTextView = (TextView) mActionBar.getCustomView().findViewById(R.id.title_text_small);
}
if (mTitleTextView != null) {
mTitleTextView.setText(R.string.title);
}
ImageView reloadButton = null;
if (mActionBar != null) {
reloadButton = (ImageView) mActionBar.getCustomView().findViewById(R.id.refresh);
}
if (reloadButton != null) {
reloadButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mWebView.reload();
Toast.makeText(getApplicationContext(), "Refresh",
Toast.LENGTH_LONG).show();
}
});
}
ImageView backButton = null;
if (mActionBar != null) {
backButton = (ImageView) mActionBar.getCustomView().findViewById(R.id.backward);
}
if (backButton != null) {
backButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mWebView.canGoBack()) {
mWebView.goBack();
}
}
});
}
ImageView forButton = null;
if (mActionBar != null) {
forButton = (ImageView) mActionBar.getCustomView().findViewById(R.id.forward);
}
if (forButton != null) {
forButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mWebView.canGoForward()) {
mWebView.goForward();
}
}
});
}
}
@Override
public void onBackPressed () {
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
super.onBackPressed();
}
}
}
First create an inflater and custom view like below: 首先创建一个如下所示的inflater和自定义视图:
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.your_custom_actionbar_xml, null);
TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.title_text_small);
mTitleTextView.setText("Bla bla bla);
ImageView img = (ImageView) mCustomView.findViewById(R.id.forward);
//.... more view
Then set custom view for action bar: 然后为操作栏设置自定义视图:
mActionBar.setCustomView(mCustomView);
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