\u6211\u4eec\u5df2\u7ecf\u4f7f\u7528Data Binding\u5b9e\u73b0\u4e86MVVM\uff0c\u5e76\u5728\u5355\u72ec\u7684\u6559\u7a0b\u4e2d\u4ecb\u7ecd\u4e86LiveData\u548cData Binding\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c06\u5728\u6211\u4eec\u7684MVVM Android\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528LiveData\u4e0eData Binding\u3002\u6211\u4eec\u5c06\u770b\u5230LiveData\u5982\u4f55\u4f7f\u5f97\u4eceViewModel\u66f4\u65b0UI\u53d8\u5f97\u5bb9\u6613\u3002<\/p>\n
\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u4e00\u76f4\u5728\u4f7f\u7528\u6570\u636e\u7ed1\u5b9a\u6765\u4eceViewModel\u66f4\u65b0\u89c6\u56fe\u3002LiveData\u662f\u4e00\u4e2a\u65b9\u4fbf\u7684\u6570\u636e\u5bb9\u5668\uff0c\u4f5c\u4e3a\u8981\u4f20\u9012\u7684\u6570\u636e\u7684\u5bb9\u5668\u3002LiveData\u6700\u5927\u7684\u4f18\u52bf\u662f\u5b83\u5177\u6709\u751f\u547d\u5468\u671f\u611f\u77e5\u529f\u80fd\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5e94\u7528\u5728\u540e\u53f0\u8fd0\u884c\uff0c\u754c\u9762\u5c31\u4e0d\u4f1a\u5c1d\u8bd5\u66f4\u65b0\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5f88\u591a\u8fd0\u884c\u65f6\u5d29\u6e83\u3002\u6211\u4eec\u5c06\u4f7f\u7528MutableLiveData\u7c7b\uff0c\u56e0\u4e3a\u5b83\u63d0\u4f9b\u4e86\u516c\u5171\u65b9\u6cd5setValue()\u548cgetValue()\u3002\u8ba9\u6211\u4eec\u4f7f\u7528\u4e0a\u8ff0\u6982\u5ff5\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u767b\u5f55\u5e94\u7528\u7a0b\u5e8f\u3002\u9996\u5148\uff0c\u6211\u4eec\u5c06\u4f7f\u7528LiveData\u4ee5\u53ca\u53cc\u5411\u6570\u636e\u7ed1\u5b9a\uff0c\u7136\u540e\u5f7b\u5e95\u5c06\u6570\u636e\u7ed1\u5b9a\u7684\u53ef\u89c2\u5bdf\u5bf9\u8c61\u91cd\u6784\u4e3aLiveData\u3002<\/p>\n
\u5728\u60a8\u5e94\u7528\u7a0b\u5e8f\u7684build.gradle\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56\u9879\uff1a<\/p>\n
\r\nandroid {\r\n ...\r\n\r\n dataBinding {\r\n enabled = true\r\n }\r\n ...\r\n}\r\n\r\ndependencies {\r\n ...\r\n implementation 'android.arch.lifecycle:extensions:1.1.1'\r\n implementation 'com.android.support:design:28.0.0-beta01'\r\n ...\r\n}\r\n\r\n<\/code><\/pre>\n\u9879\u76ee\u7ed3\u6784<\/h3>\n
LoginViewModelOld\u6587\u4ef6\u4e2d\u5c06\u5305\u542b\u65e7\u7684\u4ee3\u7801\uff0c\u800cLoginViewModel\u6587\u4ef6\u5c06\u5305\u542b\u91cd\u6784\u540e\u7684\u4ee3\u7801\u3002<\/p>\n
\u6a21\u578b<\/h3>\n
\u6211\u4eec\u5728User.java\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u6211\u4eec\u7684\u6a21\u578b\u3002<\/p>\n
package com.Olivia.androidmvvmdatabindinglivedata;\r\n\r\n\r\nimport android.util.Patterns;\r\n\r\npublic class User {\r\n\r\n private String mEmail;\r\n private String mPassword;\r\n\r\n\r\n public User(String email, String password) {\r\n mEmail = email;\r\n mPassword = password;\r\n }\r\n\r\n public String getEmail() {\r\n if (mEmail == null) {\r\n return \"\";\r\n }\r\n return mEmail;\r\n }\r\n\r\n\r\n public String getPassword() {\r\n\r\n if (mPassword == null) {\r\n return \"\";\r\n }\r\n return mPassword;\r\n }\r\n\r\n public boolean isEmailValid() {\r\n return Patterns.EMAIL_ADDRESS.matcher(getEmail()).matches();\r\n }\r\n\r\n\r\n public boolean isPasswordLengthGreaterThan5() {\r\n return getPassword().length() > 5;\r\n }\r\n\r\n}\r\n\r\n\r\n<\/code><\/pre>\n\u5e03\u5c40<\/h3>\n
\u4ee5\u4e0b\u662factivity_main.xml\u7684\u4ee3\u7801\uff1a<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<layout xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n xmlns:app=\"https:\/\/schemas.android.com\/apk\/res-auto\">\r\n\r\n <data>\r\n\r\n <variable\r\n name=\"loginViewModel\"\r\n type=\"com.Olivia.androidmvvmdatabindinglivedata.LoginViewModel\" \/>\r\n <\/data>\r\n\r\n\r\n <ScrollView\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\">\r\n\r\n <LinearLayout\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_gravity=\"center\"\r\n android:layout_margin=\"8dp\"\r\n android:orientation=\"vertical\">\r\n\r\n <android.support.design.widget.TextInputLayout\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n app:error=\"@{loginViewModel.errorEmail}\"\r\n app:errorEnabled=\"true\">\r\n\r\n <EditText\r\n android:id=\"@+id\/inEmail\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:hint=\"Email\"\r\n android:inputType=\"textEmailAddress\"\r\n android:padding=\"8dp\"\r\n android:text=\"@={loginViewModel.email}\" \/>\r\n\r\n <\/android.support.design.widget.TextInputLayout>\r\n\r\n <android.support.design.widget.TextInputLayout\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n app:error=\"@{loginViewModel.errorPassword}\"\r\n app:errorEnabled=\"true\">\r\n\r\n <EditText\r\n android:id=\"@+id\/inPassword\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:hint=\"Password\"\r\n android:inputType=\"textPassword\"\r\n android:padding=\"8dp\"\r\n android:text=\"@={loginViewModel.password}\" \/>\r\n\r\n <\/android.support.design.widget.TextInputLayout>\r\n\r\n\r\n <Button\r\n android:id=\"@+id\/button\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_marginTop=\"8dp\"\r\n android:onClick=\"@{()-> loginViewModel.onLoginClicked()}\"\r\n android:text=\"LOGIN\" \/>\r\n\r\n\r\n <ProgressBar\r\n android:id=\"@+id\/progressBar\"\r\n style=\"?android:attr\/progressBarStyleLarge\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_gravity=\"center_horizontal\"\r\n android:layout_marginTop=\"8dp\"\r\n android:visibility=\"@{loginViewModel.busy}\" \/>\r\n\r\n\r\n <\/LinearLayout>\r\n\r\n <\/ScrollView>\r\n\r\n<\/layout>\r\n\r\n<\/code><\/pre>\n\u8fdb\u5ea6\u6761\u5c06\u88ab\u663e\u793a\u4ee5\u6a21\u62df\u767b\u5f55\u529f\u80fd\u3002<\/p>\n
\u89c6\u56fe\u6a21\u578b<\/h3>\n
\u4e0b\u9762\u662fLoginViewModel.java\u7684\u4ee3\u7801:<\/p>\n
package com.Olivia.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.LiveData;\r\nimport android.arch.lifecycle.MutableLiveData;\r\nimport android.databinding.BaseObservable;\r\nimport android.databinding.Bindable;\r\nimport android.databinding.ObservableField;\r\nimport android.os.Handler;\r\nimport android.support.annotation.NonNull;\r\n\r\n\r\npublic class LoginViewModel extends BaseObservable {\r\n private String email;\r\n private String password;\r\n private int busy = 8;\r\n public final ObservableField<String> errorPassword = new ObservableField<>();\r\n public final ObservableField<String> errorEmail = new ObservableField<>();\r\n\r\n public LoginViewModel() {\r\n }\r\n\r\n private MutableLiveData<User> userMutableLiveData;\r\n\r\n LiveData<User> getUser() {\r\n if (userMutableLiveData == null) {\r\n userMutableLiveData = new MutableLiveData<>();\r\n }\r\n\r\n return userMutableLiveData;\r\n }\r\n\r\n @Bindable\r\n @NonNull\r\n public String getEmail() {\r\n return this.email;\r\n }\r\n\r\n public void setEmail(@NonNull String email) {\r\n this.email = email;\r\n notifyPropertyChanged(BR.email);\r\n }\r\n\r\n @Bindable\r\n @NonNull\r\n public String getPassword() {\r\n return this.password;\r\n }\r\n\r\n public void setPassword(@NonNull String password) {\r\n this.password = password;\r\n notifyPropertyChanged(BR.password);\r\n }\r\n\r\n @Bindable\r\n public int getBusy() {\r\n return this.busy;\r\n }\r\n\r\n public void setBusy(int busy) {\r\n this.busy = busy;\r\n notifyPropertyChanged(BR.busy);\r\n }\r\n\r\n\r\n public void onLoginClicked() {\r\n\r\n setBusy(0); \/\/View.VISIBLE\r\n new Handler().postDelayed(new Runnable() {\r\n @Override\r\n public void run() {\r\n\r\n\r\n User user = new User(getEmail(), getPassword());\r\n\r\n if (!user.isEmailValid()) {\r\n errorEmail.set(\"\u8bf7\u8f93\u5165\u6709\u6548\u7684\u7535\u5b50\u90ae\u4ef6\u5730\u5740\");\r\n } else {\r\n errorEmail.set(null);\r\n }\r\n\r\n if (!user.isPasswordLengthGreaterThan5())\r\n errorPassword.set(\"\u5bc6\u7801\u957f\u5ea6\u5e94\u5927\u4e8e5\");\r\n else {\r\n errorPassword.set(null);\r\n }\r\n\r\n userMutableLiveData.setValue(user);\r\n setBusy(8); \/\/8 == View.GONE\r\n\r\n }\r\n }, 5000);\r\n }\r\n}\r\n\r\n\r\n<\/code><\/pre>\nObservableField\u662f\u4e00\u4e2a\u5bf9\u8c61\u5305\u88c5\u5668\uff0c\u4f7f\u5176\u5177\u5907\u53ef\u89c2\u5bdf\u6027\u3002\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5c06User\u5bf9\u8c61\u5c01\u88c5\u5728LiveData\u4e2d\u3002\u6bcf\u5f53\u7528\u6237\u5bf9\u8c61\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5b83\u5c06\u5728MainActivity\u4e2d\u88ab\u89c2\u5bdf\uff0c\u5e76\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u5f53\u6309\u94ae\u88ab\u70b9\u51fb\u65f6\uff0c\u6211\u4eec\u5c06ProgressBar\u8bbe\u7f6e\u4e3a\u53ef\u89c1\u72b6\u6001\uff08View.VISIBLE = 0\uff09\u3002\u57285\u79d2\u7684\u5ef6\u8fdf\u540e\uff0c\u5c06\u9a8c\u8bc1\u7535\u5b50\u90ae\u4ef6\u548c\u5bc6\u7801\uff0c\u5e76\u66f4\u65b0TextInputLayout\u7684\u7ed1\u5b9a\u9879\u3002<\/p>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cObservableField\u4e0d\u5177\u5907\u751f\u547d\u5468\u671f\u611f\u77e5\u80fd\u529b\u3002<\/p>\n
\u4ee5\u4e0b\u662fMainActivity.java\u7c7b\u7684\u4ee3\u7801:<\/p>\n
package com.Olivia.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.Observer;\r\nimport android.databinding.DataBindingUtil;\r\nimport android.support.annotation.Nullable;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.os.Bundle;\r\nimport android.widget.Toast;\r\n\r\nimport com.Olivia.androidmvvmdatabindinglivedata.databinding.ActivityMainBinding;\r\n\r\npublic class MainActivity extends AppCompatActivity {\r\n\r\n @Override\r\n protected void onCreate(Bundle savedInstanceState) {\r\n super.onCreate(savedInstanceState);\r\n\r\n\r\n ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);\r\n LoginViewModel loginViewModel = new LoginViewModel();\r\n binding.setLoginViewModel(loginViewModel);\r\n\r\n loginViewModel.getUser().observe(this, new Observer() {\r\n @Override\r\n public void onChanged(@Nullable User user) {\r\n if (user.getEmail().length() > 0 || user.getPassword().length() > 0)\r\n Toast.makeText(getApplicationContext(), \"\u7535\u5b50\u90ae\u4ef6 : \" + user.getEmail() + \" \u5bc6\u7801 \" + user.getPassword(), Toast.LENGTH_SHORT).show();\r\n }\r\n });\r\n\r\n }\r\n}\r\n\r\n<\/code><\/pre>\n\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cobserve\u65b9\u6cd5\u4f1a\u76d1\u542cMutableLiveData\u4e2dUser\u5bf9\u8c61\u7684\u53d8\u5316\u3002\u5f53\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f1a\u663e\u793a\u4e00\u4e2a\u5305\u542b\u7528\u6237\u7535\u5b50\u90ae\u4ef6\u548c\u5bc6\u7801\u7684\u63d0\u793a\u4fe1\u606f\u3002\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u5b8c\u5168\u7528LiveData\u66ff\u6362ObservableField\u3002<\/p>\n
\u5c06ObservableField\u91cd\u6784\u4e3aLiveData<\/h3>\n
\u4ee5\u4e0b\u662f\u65b0\u7684LoginViewModel.java\u7c7b\u7684\u4ee3\u7801\uff1a<\/p>\n
package com.Olivia.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.LiveData;\r\nimport android.arch.lifecycle.MutableLiveData;\r\nimport android.arch.lifecycle.ViewModel;\r\nimport android.os.Handler;\r\n\r\n\r\npublic class LoginViewModel extends ViewModel {\r\n\r\n\r\n public MutableLiveData<String> errorPassword = new MutableLiveData<>();\r\n public MutableLiveData<String> errorEmail = new MutableLiveData<>();\r\n\r\n public MutableLiveData<String> email = new MutableLiveData<>();\r\n public MutableLiveData<String> password = new MutableLiveData<>();\r\n public MutableLiveData<Integer> busy;\r\n\r\n public MutableLiveData<Integer> getBusy() {\r\n\r\n if (busy == null) {\r\n busy = new MutableLiveData<>();\r\n busy.setValue(8);\r\n }\r\n\r\n return busy;\r\n }\r\n\r\n\r\n public LoginViewModel() {\r\n\r\n }\r\n\r\n private MutableLiveData<User> userMutableLiveData;\r\n\r\n LiveData<User> getUser() {\r\n if (userMutableLiveData == null) {\r\n userMutableLiveData = new MutableLiveData<>();\r\n }\r\n\r\n return userMutableLiveData;\r\n }\r\n\r\n\r\n public void onLoginClicked() {\r\n\r\n getBusy().setValue(0); \/\/View.VISIBLE\r\n new Handler().postDelayed(new Runnable() {\r\n @Override\r\n public void run() {\r\n\r\n\r\n User user = new User(email.getValue(), password.getValue());\r\n\r\n if (!user.isEmailValid()) {\r\n errorEmail.setValue(\"\u8bf7\u8f93\u5165\u6709\u6548\u7684\u7535\u5b50\u90ae\u4ef6\u5730\u5740\");\r\n } else {\r\n errorEmail.setValue(null);\r\n }\r\n\r\n if (!user.isPasswordLengthGreaterThan5())\r\n errorPassword.setValue(\"\u5bc6\u7801\u957f\u5ea6\u5e94\u5927\u4e8e5\");\r\n else {\r\n errorPassword.setValue(null);\r\n }\r\n\r\n userMutableLiveData.setValue(user);\r\n busy.setValue(8); \/\/8 == View.GONE\r\n\r\n }\r\n }, 3000);\r\n }\r\n}\r\n<\/code><\/pre>\n\u4e0a\u9762\u7684\u7c7b\u73b0\u5728\u6269\u5c55\u4e86ViewModel\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u518d\u9700\u8981BaseObservable\u3002\u73b0\u5728\uff0c\u6211\u4eec\u5df2\u7ecf\u5c06ObservableFields\u66f4\u6539\u4e3aMutableLiveData\u3002\u7531\u4e8e\u6570\u636e\u7ed1\u5b9a\u7684\u5e2e\u52a9\uff0cMutableLiveData\u4e2d\u7684\u66f4\u6539\u4f1a\u81ea\u52a8\u66f4\u65b0\u5230\u5e03\u5c40\u4e2d\u3002\u6211\u4eec\u7684MainActivity.java\u7c7b\u73b0\u5728\u5df2\u66f4\u65b0\u4e3a:<\/p>\n
package com.Olivia.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.Observer;\r\nimport android.arch.lifecycle.ViewModelProviders;\r\nimport android.databinding.DataBindingUtil;\r\nimport android.support.annotation.Nullable;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.os.Bundle;\r\nimport android.widget.Toast;\r\n\r\nimport com.Olivia.androidmvvmdatabindinglivedata.databinding.ActivityMainBinding;\r\n\r\npublic class MainActivity extends AppCompatActivity {\r\n\r\n @Override\r\n protected void onCreate(Bundle savedInstanceState) {\r\n super.onCreate(savedInstanceState);\r\n\r\n\r\n ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);\r\n LoginViewModel loginViewModel = ViewModelProviders.of(this).get(LoginViewModel.class);\r\n binding.setLoginViewModel(loginViewModel);\r\n binding.setLifecycleOwner(this);\r\n \r\n\r\n loginViewModel.getUser().observe(this, new Observer() {\r\n @Override\r\n public void onChanged(@Nullable User user) {\r\n if (user.getEmail().length() > 0 || user.getPassword().length() > 0)\r\n Toast.makeText(getApplicationContext(), \"\u90ae\u7bb1\uff1a\" + user.getEmail() + \" \u5bc6\u7801\uff1a\" + user.getPassword(), Toast.LENGTH_SHORT).show();\r\n }\r\n });\r\n\r\n }\r\n}\r\n\r\n<\/code><\/pre>\nViewModelProviders.of\u4e5f\u53ef\u4ee5\u7528\u4e8e\u521b\u5efaViewModel\u5b9e\u4f8b\uff0c\u5c31\u50cf\u4e0a\u9762\u90a3\u6837\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ea\u5b9e\u4f8b\u5316ViewModel\u4e00\u6b21\u3002\u6bcf\u6b21\u540e\u7eed\u8c03\u7528\u90fd\u4f1a\u91cd\u7528\u8fd9\u4e2a\u5b9e\u4f8b\u3002LifecycleOwner\u662f\u4e00\u4e2a\u6211\u4eec\u7684Activity\u53ef\u4ee5\u7ed1\u5b9a\u5230\u7684\u63a5\u53e3\u3002\u4e0a\u8ff0\u5e94\u7528\u7a0b\u5e8f\u7684\u8f93\u51fa\u5982\u4e0b\u6240\u793a\uff1a\u6b63\u5982\u4f60\u6240\u770b\u5230\u7684\uff0c\u5f53\u7528\u6237\u79bb\u5f00\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0cToast\u6d88\u606f\u4e0d\u4f1a\u663e\u793a\u3002\u56e0\u4e3aLiveData\u662f\u611f\u77e5\u751f\u547d\u5468\u671f\u7684\u3002\u5f53\u4f60\u518d\u6b21\u6253\u5f00\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0cToast\u5c06\u4f1a\u663e\u793a\u3002\u8fd9\u5c31\u7ed3\u675f\u4e86\u672c\u6559\u7a0b\u3002\u4f60\u53ef\u4ee5\u4ece\u4e0b\u9762\u7684\u94fe\u63a5\u4e0b\u8f7d\u8fd9\u4e2a\u9879\u76ee\uff1a<\/p>\n
\u5b89\u5353MVVM\u6570\u636e\u7ed1\u5b9aLiveData<\/p>\n
Github \u9879\u76ee\u94fe\u63a5<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4eec\u5df2\u7ecf\u4f7f\u7528Data Binding\u5b9e\u73b0\u4e86MVVM\uff0c\u5e76\u5728\u5355\u72ec\u7684\u6559\u7a0b\u4e2d\u4ecb\u7ecd\u4e86LiveData\u548cData Bind […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1247,1250,1249,1251,1248],"class_list":["post-382","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-android-mvvm","tag-android","tag-data-binding","tag-jetpack","tag-livedata"],"yoast_head":"\n
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