Android通过多个活动发送额外的数据

Question

I have a chain of intents

1) Select File

2) Overlay some stuff

3) Save on Disk

4) Upload to Server

This means that i am using those commands 4 times:

video_id = extras.getString("video_id");
i.putExtra("video_id", video_id);'

Is there another neat way of doing that, without having to write anything on disc or db?

Answer 1

You can use Singleton Class ie Application in android. It maintains global application state.

public class GlobalClass extends Application{
    private String name;

    public String getName() {

        return name;
    }
}

Assign GlobalClass.java in application tag in application Manifest.xml android:name="com.androidexample.globalvariable.GlobalClass"

After Assigning you can set or access this variable from any activity using following code.

    final GlobalClass globalVariable = (GlobalClass) getApplicationContext();
    //Set name in global/application context
    globalVariable.setName("Android Example context variable");

   //get name frim global/application context from any other activity.
   String name = globalVariable.getName();

Answer 2

Use SharedPreference. Please check http://developer.android.com/training/basics/data-storage/shared-preferences.html SharedPreference will not delete automatically.