Java ClassCastException android
这是我的主要应用程序Java ClassCastException android,java,android,Java,Android,这是我的主要应用程序 public class MainApp extends Application { private MainComponent component; private static Context context; public MainApp() { this.component = initDagger(); context = getApplicationContext(); } public
public class MainApp extends Application {
private MainComponent component;
private static Context context;
public MainApp() {
this.component = initDagger();
context = getApplicationContext();
}
public MainComponent getComponent() {
return component;
}
public static Context getContext() {
return context;
}
private MainComponent initDagger() {
return DaggerMainComponent.builder().build();
}
}
在主要活动中,我使用以下代码并收到一个错误
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
unbinder = ButterKnife.bind(this);
((MainApp) getApplication()).getComponent().inject(this);
// presenter = new MainActivityPresenter();
presenter.attachView(this);
}
这就是我收到的错误。它说我不能将应用程序转换到MainApp。但我遵循匕首的例子,我看到他们这样做,它的工作。
我的代码有什么问题
Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to com.example.huytrinh.sampledagger.MainApp
at com.example.huytrinh.sampledagger.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:5360)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2336)
试试这个
首先
<application
android:name=".MainApp"
... />
获取MainApp
private static MainApp instance;
public
static MainApp getInstance() {
return instance;
}
@Override
public void onCreate() {
super.onCreate();
instance = this;
}
秒
MainApp.getInstance().getComponent().inject(this);
编辑
<application
android:name=".MainApp"
... />
在清单中将您的姓名添加到应用程序标记中
<application
android:name=".MainApp"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
1.您遇到异常,因为您无法在清单中包含自定义应用程序类。请像下面这样在清单中添加该类
<application
android:name=".MainApp"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"