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This article "how to use Application to set global variables in Android" article knowledge points most people do not understand, so Xiaobian to summarize the following content, detailed content, clear steps, has a certain reference value, I hope you can read this article to gain something, let's take a look at this article "how to use Application to set global variables in Android" article bar.

Application Setting global variables and passing values

public class MyApplication extends Application {private String name;@Overridepublic void onCreate() {super.onCreate();setName(NAME); //Initialize global variables}public String getName() {return name;}public void setName(String name) {this.name = name;}private static final String NAME = "MyApplication";}

Ok, the application is created, but we should add the application MyApplication to be run in the configuration file ApplicationManifest.xml, and modify it as follows:

That's right here. We'll set the default Application we used all the time to MyApplication we made ourselves.

When the xml configuration file runs android:name=".MyApplication">, then the process ID is assigned, and then we will run our Activity.

public class MyFirstActivity extends Activity {private MyApplication app;@Overridepublic void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState);setContentView (R.layout.main);app =(MyApplication) getApplication(); //Get our application MyApplicationLog.e ("MyFirstActivityOriginal", app.getName()); //Take out the global variable we put in the process to see if it is the value we set app.setName ("is cool"); //OK, now we start modifying Log.e.("MyFirstActivityChanged", app.getName()); //Look again, this value changed No Intent = new Intent();//More importantly, we can see whether we get the initialized value in another Activity or the modified intent.setClass(this, MySecondActivity.class);startActivity(intent);}}

When you finish running above, you will jump to this Activity

public class MySecondActivity extends Activity {private MyApplication app;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);app = (MyApplication) getApplication(); //Get App Log.e("MySecondActivity", app.getName()); //Get Global Value}}

OK, look at the value: of course I've run it,

MyFirstActivityOriginal MyApplication MyFirstActivityChanged is coolMySecondActivity is cool The above is about the content of this article "How to use Application to set global variables in Android". I believe everyone has a certain understanding. I hope the content shared by Xiaobian will be helpful to everyone. If you want to know more related knowledge content, please pay attention to the industry information channel.

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