android studio使用android annotations注解

其实我觉得并没有什么卵用，为了了解依赖注入学习下这个。1. 在project/build.gradle中添加以下内容:    buildscript {    repositories {        jcenter()        //注解        mavenCentral()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.2'        // NOTE: Do not place your application dependencies here; they belong        // in the individual module build.gradle files        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'//注解    }}allprojects {    repositories {        jcenter()        //注解        mavenCentral()        mavenLocal()    }}task clean(type: Delete) {    delete rootProject.buildDir}2. 在app/build.gradle中添加以下内容：apply plugin: 'com.android.application'//注解 beginapply plugin: 'android-apt'def AAVersion = '3.3.1'//注解 endandroid {    compileSdkVersion 26    buildToolsVersion '25.0.2'    defaultConfig {        applicationId "com.baron.ch"        minSdkVersion 19        targetSdkVersion 26        versionCode 1        versionName "1.0"        vectorDrawables.useSupportLibrary = true    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}//注解 beginapt {    arguments {        androidManifestFile variant.outputs[0].processResources.manifestFile    }}//注解 enddependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    compile 'com.android.support:appcompat-v7:25.3.1'    compile 'com.android.support:design:26.+'    compile 'com.android.support:support-vector-drawable:26.+'    compile 'com.android.support.constraint:constraint-layout:1.0.2'    compile 'com.android.support:support-v4:26.+'    //注解 begin    apt "org.androidannotations:androidannotations:$AAVersion"    compile "org.androidannotations:androidannotations-api:$AAVersion"    //注解 end}3. 在AndroidManifest.xml中的所有activity名称后面添加下划线                                                                                添加后会变红，不用管。然后编译，能通过就没问题了。4. 使用import org.androidannotations.annotations.AfterViews;import org.androidannotations.annotations.Click;import org.androidannotations.annotations.EActivity;import org.androidannotations.annotations.Fullscreen;import org.androidannotations.annotations.LongClick;import org.androidannotations.annotations.NoTitle;import org.androidannotations.annotations.ViewById;@NoTitle@Fullscreen@EActivity(R.layout.activity_test_aat)public class TestAatActivity extends AppCompatActivity {    @ViewById    Button btnOk;    @ViewById    Button btnCancel;    @ViewById    TextView tv_testaat;    @Click({R.id.btn_ok, R.id.btn_cancel})    public void onClick(View view) {        switch (view.getId()) {            case R.id.btn_ok:                tv_testaat.setText("hello aat ok");                break;            case R.id.btn_cancel:                tv_testaat.setText("hello aat cancel");                break;        }    }    @LongClick({R.id.btn_cancel})    public void longClick(View view) {        /*int id = view.getId();        switch (id) {            case R.id.btn_cancel:                tv_testaat.setText("btn cancel made a long click");                break;        }*/        tv_testaat.setText("btn cancel made a long click");    }    @AfterViews    public void init(){        Log.e("tag","init");    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        Log.e("tag", "onCreate");        //可省略！        //setContentView(R.layout.activity_my);        //tv_testaat.setText("hello");  报错，空指针异常        //因为在onCreate()被调用的时候，@ViewById还没有被set，也就是都为null        //所以如果你要对组件进行一定的初始化，那么你要用@AfterViews注解    }    @Override    protected void onResume() {        super.onResume();        Log.e("tag","onResume");    }    @Override    protected void onStart() {        super.onStart();        Log.e("tag","onStart");    }}参考连接:https://github.com/androidannotations/androidannotations/wiki
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