从静态方法启动 Android Activity
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原文地址: http://stackoverflow.com/questions/20044163/
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Starting an Android Activity from a static method
提问by Nathan
I want to start an activity from a static java method on an android device. I do not have any context or anything passed as parameter to the static function. For starting the activity I must call "startActivity" with the current running method as "this" pointer. So is there a way to get the current running activity?
我想从 android 设备上的静态 java 方法开始一个活动。我没有任何上下文或任何作为参数传递给静态函数的内容。为了启动活动，我必须使用当前运行的方法作为“this”指针调用“startActivity”。那么有没有办法获取当前正在运行的活动呢？
回答by Biraj Zalavadia
You can access only static variables/objects inside static method. So You need to Implement this way
您只能访问静态方法内的静态变量/对象。所以你需要以这种方式实现
public class MainActivity extends Activity {
private static Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
}
public static void goToLoginActivity() {
Intent login = new Intent(mContext, LoginActivity.class);
mContext.startActivity(login);
}
}
NOTE :But this is not the proper way to do so, this may cause window leak issue.
注意：但这不是正确的方法，这可能会导致窗口泄漏问题。
Better approach is pass activity/context object as parameter like this.
更好的方法是将活动/上下文对象作为这样的参数传递。
public static void goToLoginActivity(Context mContext) {
Intent login = new Intent(mContext, LoginActivity.class);
mContext.startActivity(login);
}
回答by Techfist
Create a Class in your app extending class Application, define a static context and initialise this with your application context. You can expose a static method from this class for accessing defined static reference. Thats it.
在您的应用程序中创建一个扩展类 Application 的类，定义一个静态上下文并使用您的应用程序上下文对其进行初始化。您可以公开此类中的静态方法以访问定义的静态引用。就是这样。
class MyApp extends Application{
private static Context mContext;
public void onCreate(){
mContext = this.getApplicationContext();
}
public static Context getAppContext(){
return mContext;
}
}
Now you can use this static method for accessing context anywhere in your app.
现在，您可以使用此静态方法访问应用程序中任何位置的上下文。
