在preferenceActivity没有动作条后升级到支持库V21 [英] No ActionBar in PreferenceActivity after upgrade to Support Library v21
问题描述
在我升级到支持库V21我的动作条在我的<一个href="http://developer.android.com/reference/android/$p$pference/$p$pferenceActivity.html"><$c$c>$p$pferenceActivity已经一去不复返了。
After I upgraded to the Support Library v21 my ActionBar in my PreferenceActivity is gone.
我错过了一些属性在我的主题，再次激活它？我有一些类似的麻烦黑色的ActionBar 。
Did I miss some attributes in my theme to activate it again? I had some similar trouble with a black ActionBar.
我也尝了一口的hackish通过增加一个<一个将其添加href="http://developer.android.com/reference/android/support/v7/widget/Toolbar.html"><$c$c>Toolbar根布局，但没有达到预期效果。
I also tried to add it a little hackish by adding a Toolbar to the root layout, but that did not work as expected.
推荐答案
非常相似，自己的code倒是XML允许设置标题：
Very Similar to your own code but added xml to allow for set title:
继续使用 preferenceActivity ：
settings_toolbar.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
app:navigationContentDescription="@string/abc_action_bar_up_description"
android:background="?attr/colorPrimary"
app:navigationIcon="?attr/homeAsUpIndicator"
app:title="@string/action_settings"
/>
SettingsActivity.java：
public class SettingsActivity extends PreferenceActivity {
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
LinearLayout root = (LinearLayout)findViewById(android.R.id.list).getParent().getParent().getParent();
Toolbar bar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.settings_toolbar, root, false);
root.addView(bar, 0); // insert at top
bar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}
结果：
正如<一个href="http://stackoverflow.com/questions/26564400/creating-a-$p$pference-screen-with-support-v21-toolbar/27455330?noredirect=1#comment43790647_27455330">here,姜饼设备正在返回的NullPointerException在这条线：
As pointed out here, Gingerbread Devices are returning NullPointerException on this line:
LinearLayout root = (LinearLayout)findViewById(android.R.id.list).getParent().getParent().getParent();
FIX：
SettingsActivity.java：
public class SettingsActivity extends PreferenceActivity {
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
Toolbar bar;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
LinearLayout root = (LinearLayout) findViewById(android.R.id.list).getParent().getParent().getParent();
bar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.settings_toolbar, root, false);
root.addView(bar, 0); // insert at top
} else {
ViewGroup root = (ViewGroup) findViewById(android.R.id.content);
ListView content = (ListView) root.getChildAt(0);
root.removeAllViews();
bar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.settings_toolbar, root, false);
int height;
TypedValue tv = new TypedValue();
if (getTheme().resolveAttribute(R.attr.actionBarSize, tv, true)) {
height = TypedValue.complexToDimensionPixelSize(tv.data, getResources().getDisplayMetrics());
}else{
height = bar.getHeight();
}
content.setPadding(0, height, 0, 0);
root.addView(content);
root.addView(bar);
}
bar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}
通过上述的任何问题，让我知道！
Any issues with the above let me know!
更新2：着色替代方法
正如许多开发笔记 preferenceActivity 不支持元素的着色，但通过利用一些内部类可以实现这一点。即至这些类被除去。 （适用于使用appCompat支持-V7 v21.0.3）。
As pointed out in many dev notes PreferenceActivity does not support tinting of elements, however by utilising a few internal classes you CAN achieve this. That is until these classes are removed. (Works using appCompat support-v7 v21.0.3).
添加以下的进口：
import android.support.v7.internal.widget.TintCheckBox;
import android.support.v7.internal.widget.TintCheckedTextView;
import android.support.v7.internal.widget.TintEditText;
import android.support.v7.internal.widget.TintRadioButton;
import android.support.v7.internal.widget.TintSpinner;
然后重写 onCreateView 方法：
@Override
public View onCreateView(String name, Context context, AttributeSet attrs) {
// Allow super to try and create a view first
final View result = super.onCreateView(name, context, attrs);
if (result != null) {
return result;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
// If we're running pre-L, we need to 'inject' our tint aware Views in place of the
// standard framework versions
switch (name) {
case "EditText":
return new TintEditText(this, attrs);
case "Spinner":
return new TintSpinner(this, attrs);
case "CheckBox":
return new TintCheckBox(this, attrs);
case "RadioButton":
return new TintRadioButton(this, attrs);
case "CheckedTextView":
return new TintCheckedTextView(this, attrs);
}
}
return null;
}
结果：
AppCompat 22.1引入了新的着色元素，这意味着不再有必要利用内部类来达到同样的效果作为最后更新。相反，按照这个（仍然覆盖 onCreateView ）：
AppCompat 22.1 introduced new tinted elements, meaning that there is no longer a need to utilise the internal classes to achieve the same effect as the last update. Instead follow this (still overriding onCreateView):
@Override
public View onCreateView(String name, Context context, AttributeSet attrs) {
// Allow super to try and create a view first
final View result = super.onCreateView(name, context, attrs);
if (result != null) {
return result;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
// If we're running pre-L, we need to 'inject' our tint aware Views in place of the
// standard framework versions
switch (name) {
case "EditText":
return new AppCompatEditText(this, attrs);
case "Spinner":
return new AppCompatSpinner(this, attrs);
case "CheckBox":
return new AppCompatCheckBox(this, attrs);
case "RadioButton":
return new AppCompatRadioButton(this, attrs);
case "CheckedTextView":
return new AppCompatCheckedTextView(this, attrs);
}
}
return null;
}
巢式preFERENCE SCREENS
很多人都遇到了问题，包括工具栏嵌套＆LT; preferenceScreen /＆GT; s ^不过，我已经找到了解决办法！ - 大量的试验和错误之后
A lot of people are experiencing issues with including the Toolbar in nested <PreferenceScreen />s however, I have found a solution!! - After a lot of trial and error!
以下内容添加到您的 SettingsActivity ：
@SuppressWarnings("deprecation")
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
super.onPreferenceTreeClick(preferenceScreen, preference);
// If the user has clicked on a preference screen, set up the screen
if (preference instanceof PreferenceScreen) {
setUpNestedScreen((PreferenceScreen) preference);
}
return false;
}
public void setUpNestedScreen(PreferenceScreen preferenceScreen) {
final Dialog dialog = preferenceScreen.getDialog();
Toolbar bar;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
LinearLayout root = (LinearLayout) dialog.findViewById(android.R.id.list).getParent();
bar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.settings_toolbar, root, false);
root.addView(bar, 0); // insert at top
} else {
ViewGroup root = (ViewGroup) dialog.findViewById(android.R.id.content);
ListView content = (ListView) root.getChildAt(0);
root.removeAllViews();
bar = (Toolbar) LayoutInflater.from(this).inflate(R.layout.settings_toolbar, root, false);
int height;
TypedValue tv = new TypedValue();
if (getTheme().resolveAttribute(R.attr.actionBarSize, tv, true)) {
height = TypedValue.complexToDimensionPixelSize(tv.data, getResources().getDisplayMetrics());
}else{
height = bar.getHeight();
}
content.setPadding(0, height, 0, 0);
root.addView(content);
root.addView(bar);
}
bar.setTitle(preferenceScreen.getTitle());
bar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
}
而之所以 preferenceScreen 的是这样的痛苦是因为它们基于作为包装对话，所以我们需要捕捉的对话框布局添加工具栏吧。
The reason that PreferenceScreen's are such a pain is because they are based as a wrapper dialog, so we need to capture the dialog layout to add the toolbar to it.
在设计上导入工具栏不允许抬高和阴影在pre-V21的设备，所以如果你想有抬高你的工具栏你需要把它包在 AppBarLayout ：
By design importing the Toolbar does not allow for elevation and shadowing in pre-v21 devices, so if you would like to have elevation on your Toolbar you need to wrap it in a AppBarLayout:
`settings_toolbar.xml：
`settings_toolbar.xml :
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
.../>
</android.support.design.widget.AppBarLayout>
不要忘记添加添加设计支持库在 build.gradle 文件的依赖关系：
compile 'com.android.support:support-v4:22.2.0'
compile 'com.android.support:appcompat-v7:22.2.0'
compile 'com.android.support:design:22.2.0'
这篇关于在preferenceActivity没有动作条后升级到支持库V21的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
