无法获取简单的TextView以与Android数据绑定一起使用 [英] Cannot Get a simple TextView to work with Android Data Binding
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问题描述
好的，我终于编译了我的Android数据绑定代码。现在，它不符合我的预期。当我从 Activity 活动中调用 setCurrentShopperInfo（）时，我的 TextView （s）不会使用我设置的 String s的值进行更新。
OK, I finally have my Android Data Binding code compiling. Now, It does not work as I expect. When I call setCurrentShopperInfo() from my Activity, My TextView(s) do not update with the Strings values I'm setting.
注意：：我也使用 ObservableField （s）进行了尝试，结果相同。
NOTE: I also tried this with using ObservableField(s), same result.
这里有 HAS 是我不理解的地方：
There HAS to be something I'm not understanding here:
布局：
<data>
<variable name="currentShopperViewModel" type="ts.kiosk.app.checkout.viewmodels.CurrentShopperViewModel" />
<import type="android.view.View" />
</data>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/checkout_titlebar"
android:layout_width="match_parent"
android:layout_height="@dimen/app_header_height"
android:layout_alignParentTop="true"
android:background="@color/header_bkgrd">
<ImageView
android:id="@+id/img_ts_logo"
android:layout_width="@dimen/app_icon_width"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/app_icon_margin"
android:layout_marginRight="@dimen/app_icon_margin"
android:src="@drawable/touchsides_logo_notext"/>
<TextView
android:id="@+id/text_appname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/title_checkout"
android:layout_toRightOf="@+id/img_ts_logo"
android:layout_centerVertical="true"
style="@style/screenTitle"/>
<LinearLayout
android:visibility="visible"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:layout_toRightOf="@+id/text_appname"
android:layout_toLeftOf="@+id/img_settings_menu"
android:paddingRight="20dip"
android:paddingLeft="20dip"
android:gravity="center_horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{currentShopperViewModel.textShopperInfoName}"
style="@style/previous_transaction_titlebar"></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{currentShopperViewModel.textShopperInfoCashback}"
style="@style/previous_transaction_titlebar_cashback"
android:layout_marginLeft="20dip"></TextView>
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{currentShopperViewModel.textShopperInfoPoints}"
style="@style/previous_transaction_titlebar_points"
android:layout_marginLeft="20dip"></TextView>
</LinearLayout>
活动：
mCurentShopperViewModel = new CurrentShopperViewModel(this);
final ActivityCheckoutNewBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_checkout_new);
binding.setCurrentShopperViewModel(mCurentShopperViewModel);
查看模型：
public class CurrentShopperViewModel extends BaseObservable{
Context mCtx;
//public ObservableBoolean showShopperInfo = new ObservableBoolean();
private String textShopperInfoName;
private String textShopperInfoCashback;
private String textShopperInfoPoints;
@Bindable
public String getTextShopperInfoName() {
return this.textShopperInfoName;
}
@Bindable
public String getTextShopperInfoCashback() {
return this.textShopperInfoCashback;
}
@Bindable
public String getTextShopperInfoPoints() {
return this.textShopperInfoPoints;
}
public void setTextShopperInfoName(String name) {
this.textShopperInfoName = name;
notifyPropertyChanged(BR.textShopperInfoName);
}
public void setTextShopperInfoCashback(String cashback) {
this.textShopperInfoCashback = cashback;
notifyPropertyChanged(BR.textShopperInfoCashback);
}
public void setTextShopperInfoPoints(String points) {
this.textShopperInfoPoints = points;
notifyPropertyChanged(BR.textShopperInfoPoints);
}
public CurrentShopperViewModel(Context context) {
mCtx = context;
}
public void setCurrentShopperInfo(CardStructure cardStructure ) {
//show(true);
int[] card = CardUtil.getInstance().getBalance(cardStructure);
setTextShopperInfoName( String.format( "%s %s", mCtx.getResources().getString(R.string.item_wallet_desposit) , Formatter.formatCurrency(CheckoutApplication.LOCALE,card[0]) ) );
setTextShopperInfoCashback( String.format( "%s %s", mCtx.getResources().getString(R.string.item_wallet_desposit) , Formatter.formatCurrency(CheckoutApplication.LOCALE,card[0]) ) );
setTextShopperInfoPoints ( String.format( "%s %s", mCtx.getResources().getString(R.string.item_loyalty_points),card[1] ) );
}
GRADLE：
buildscript {
repositories {
mavenCentral()
maven { url 'http://download.crashlytics.com/maven' }
maven { url 'https://oss.sonatype.org/content/repositories/ksoap2-android-releases/' }
}
dependencies {
classpath 'com.crashlytics.tools.gradle:crashlytics-gradle:1.+'
classpath 'com.google.code.ksoap2-android:ksoap2-android:3.1.1'
}
}
apply plugin: 'com.android.application'
apply plugin: 'crashlytics'
repositories {
maven { url 'http://download.crashlytics.com/maven' }
maven { url 'https://oss.sonatype.org/content/repositories/ksoap2-android-releases/' }
}
android {
compileSdkVersion 20
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "ts.kiosk.app.checkout"
minSdkVersion 16
targetSdkVersion 16
versionCode 2
versionName "0.0.2.258"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
lintOptions {
abortOnError false
}
sourceSets {
main {
assets.srcDirs = ['src/main/assets', 'src/main/assets/']
}
}
dataBinding{
enabled = true
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:support-v4:20.0.0'
compile 'com.crashlytics.android:crashlytics:1.+'
compile 'net.danlew:android.joda:2.7.2'
compile 'com.google.code.ksoap2-android:ksoap2-android:3.1.1'
compile 'com.squareup.retrofit:retrofit:1.6.1'
compile 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
//compile 'com.squareup.okhttp:okhttp:2.0.0'
// Robolectric
testCompile 'junit:junit:4.12'
testCompile 'org.hamcrest:hamcrest-library:1.3'
testCompile 'org.apache.maven:maven-ant-tasks:2.1.3' // fixes issue on linux/mac
testCompile 'org.robolectric:robolectric:3.0'
compile project(':asterixmodule')
compile project(':servicemodule')
compile project(':sdfclient')
}
android {
packagingOptions {
exclude 'META-INF/maven/com.squareup.okhttp/okhttp/pom.properties'
exclude 'META-INF/maven/com.squareup.okhttp/okhttp/pom.xml'
}
}
LOGCAT：
不知道在这里有什么意义，但是我从<$ c $中调用 setCurrentShopperInfo（）后看到了c>活动：
Not sure what what would be significant here, but I see this after I call setCurrentShopperInfo() from my Activity:
04-12 21:31:30.252 866-866/ts.kiosk.app.checkout E/java.lang.StackTraceElement: InterfaceError
NOTIFY属性已更改调试
NOTIFY PROPERTY CHANGED Debugging
我进入了notifyPropertyChanged（）方法并且mCallbacks的大小为0 ---正确吗？
I stepped into the notifyPropertyChanged() method and mCallbacks size is 0 --- is that correct?
/**
* Notifies listeners that a specific property has changed. The getter for the property
* that changes should be marked with {@link Bindable} to generate a field in
* <code>BR</code> to be used as <code>fieldId</code>.
*
* @param fieldId The generated BR id for the Bindable field.
*/
public void notifyPropertyChanged(int fieldId) {
if (mCallbacks != null) {
mCallbacks.notifyCallbacks(this, fieldId, null);
}
}
我还尝试了ObservableField设置数据绑定的方法，其中最终将其称为：
I also tried the ObservableField way of setting data binding where ultimately this is called:
public synchronized void notifyChange() {
if (mCallbacks != null) {
mCallbacks.notifyCallbacks(this, 0, null);
}
}
和mCallbacks再次为空，我在想是一个问题，但不知道如何调试它。
and mCallbacks is again null and I'm thinking that is an issue but don't know how to debug it.
推荐答案
我的问题是在OnCreate（）中，我正在调用setContentView （）两次...一次用于数据绑定，然后再次使用旧方法（显然覆盖了数据绑定）：
My problem was that in OnCreate() I was calling setContentView() twice ...once for the data binding and then again the old way (which apparently overwrote the data binding):
DataBindingUtil.setContentView(this, R.layout.activity)
//other code here
setContentView(R.layout.activity);
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