Android的数据绑定工作不正常 [英] The android data binding is not working properly
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问题描述
我想帮助解决问题。
首先，在我的code中的细节：
First, following the details of my code:
build.gradle (Project: android)
buildscript {
repositories {
jcenter()
mavenCentral()
maven { url '/home/melti/java/repository' }
}
dependencies {
classpath "com.android.tools.build:gradle:1.3.0-beta4"
classpath "com.android.databinding:dataBinder:1.0-rc0"
}
}
allprojects {
repositories {
jcenter()
mavenCentral()
maven { url '/home/melti/java/repository' }
}
}
build.gradle（模块：应用程序）
build.gradle (Module: app)
apply plugin: 'com.android.application'
apply plugin: 'com.android.databinding'
android {
compileSdkVersion 22
buildToolsVersion "23.0.0 rc2"
defaultConfig {
applicationId "br.com.soma"
minSdkVersion 16
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.0.0'
compile 'com.android.support:recyclerview-v7:21.0.3'
compile 'com.android.support:cardview-v7:21.0.3'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.squareup.okhttp:okhttp:2.4.0'
compile 'com.google.code.gson:gson:2.3.1'
compile 'org.springframework:spring-core:4.1.7.RELEASE'
compile 'org.apache.commons:commons-io:1.3.2'
}
AmanteEditModel
AmanteEditModel
package br.com.soma.amante.edit;
import android.databinding.BaseObservable;
import android.databinding.Bindable;
import br.com.soma.BR;
/**
* Created by spassu on 09/07/15.
*/
public class AmanteEditModel extends BaseObservable {
private String senhaConfirm;
@Bindable
public String getSenhaConfirm() {
return senhaConfirm;
}
public void setSenhaConfirm(String senhaConfirm) {
this.senhaConfirm = senhaConfirm;
notifyPropertyChanged(BR.senhaConfirm);
}
}
fragment_amante_edit
fragment_amante_edit
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto">
<data>
<variable name="model" type="br.com.soma.amante.edit.AmanteEditModel"/>
</data>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
style="@style/card_edit_style"
android:layout_gravity="top"
card_view:cardCornerRadius="0dp">
<EditText
android:id="@+id/amante_edit_senha_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:hint="Confirme a senha"
android:inputType="textPassword"
android:maxLines="1"
android:text="@{model.senhaConfirm}"
/>
</android.support.v7.widget.CardView>
</ScrollView>
</layout>
AmanteEditFragment
AmanteEditFragment
package br.com.soma.amante.edit;
import android.app.Fragment;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import br.com.soma.R;
import br.com.soma.amante.view.AmanteViewActivity;
import br.com.soma.databinding.FragmentAmanteEditBinding;
/**
* Created by spassu on 27/05/15.
*/
public class AmanteEditFragment extends Fragment {
private AmanteEditModel model;
private static final String AMANTE_ID = "amanteId";
public static final String DEFAULT_FRAGMENT_TAG = "amanteEditFragment";
// Views
private long amanteId;
public AmanteEditFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
model = new AmanteEditModel();
FragmentAmanteEditBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_amante_edit, container, false);
binding.setModel(model);
return binding.getRoot();
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.menu_amante_edit, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
// The Save button was pressed
case R.id.menu_amante_edit_save:
save();
getActivity().finish();
return true;
}
return super.onOptionsItemSelected(item);
}
public static AmanteEditFragment newInstance(long id) {
AmanteEditFragment fragment = new AmanteEditFragment();
Bundle args = new Bundle();
args.putLong(AmanteViewActivity.EXTRA_AMANTEID, id);
fragment.setArguments(args);
return fragment;
}
private void save() {
Toast.makeText(getActivity(), model.getSenhaConfirm(), Toast.LENGTH_SHORT).show();
}
}
在 senhaConfirm ，点击保存（），我发现，绑定不工作，那输入数据后，是时， senhaConfirm 到 AmanteEditModel 为空呢。谁能帮助我？
After enter data in senhaConfirm and clickingsave(), I found that the binding does not work, that is, the senhaConfirm into AmanteEditModel is null yet. Can anyone help me?
推荐答案
对于用户输入的Android数据绑定只有一个办法。图形用户界面将自动地反映在模型中的任何变化，而不是相反。
With respect to user input Android Databinding is only one way. The GUI will automagically reflect any changes in the model, but not vice versa.
您需要一个TextChangeListener添加到这台模型属性，当用户更改任何模型类。
You need to add a TextChangeListener to your model class which sets the model property when the user changes anything.
例如：
public class AmanteEditModel extends BaseObservable {
private String senhaConfirm;
@Bindable
public String getSenhaConfirm() {
return senhaConfirm;
}
public void setSenhaConfirm(String senhaConfirm) {
this.senhaConfirm = senhaConfirm;
notifyPropertyChanged(BR.senhaConfirm);
}
// Textwatcher Reference: http://developer.android.com/reference/android/text/TextWatcher.html
public TextWatcher getMyEditTextWatcher() {
return new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
public void onTextChanged(CharSequence s, int start,
int before, int count) {
// Important! Use the property setter, otherwhise the model won't be informed about the change.
setSenhaConfirm(s);
}
};
}
}
在你的布局XML改变的EditText这样：
In your layout xml change EditText to this:
<EditText
android:id="@+id/amante_edit_senha_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:hint="Confirme a senha"
android:inputType="textPassword"
android:maxLines="1"
android:text="@{model.senhaConfirm}"
app:addTextChangeListener="@{model.myEditTextWatcher}"
/>
留意的 addTextChangeListener 的命名空间。通过Android这个方法可能无法使用：命名空间，所以我使用的应用程序：在这里。你也可以使用绑定：使结合更加清晰。
Watch for the namespace of addTextChangeListener. This method might not be available through the android: namespace, so I'm using app: here. You may also use bind: to make the binding more clear.
所以，千万不要错过添加
So don't miss to add
xmlns:app="http://schemas.android.com/apk/res-auto"
或
xmlns:bind="http://schemas.android.com/apk/res-auto"
你的XML命名空间。
to your XML namespaces.
该解决方案适用于所有输入控件，自定义在内，给你提供了正确的监听器模型中的。
This solution works for all input controls, custom included, given you provide the correct Listeners in your model.
这篇关于Android的数据绑定工作不正常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！
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