Exit the program anytime, anywhere

Partly excerpted from "The First Line of Code" Guo Lin

1. Find the activity used by the current interface

Create a new class to inherit Activity and override its onCreate() method

public class BaseActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        Log.e("BaseActivity" , getClass().getSimpleName());
    }
}

· Make BaseActivity the parent class of all activities in the project and run the project. It can be done under Android Monitor -> Error

See the activities used in the current interface.

2. Exit the program anytime, anywhere

Create a new activity manager class

public class ActivityCollector {
    public static List<Activity> activities = new ArrayList<Activity>();

    public static void addActivity(Activity activity ){
        activities.add(activity);
    }

    public static  void removeActivity(Activity activity ){
        activities.remove(activity);
    }

    public static void finishAll(){
        for(Activity activity : activities){
            if(!activity.isFinishing()){
                activity.finish();
            }
        }
    }

Define the parent class that each activity needs to inherit

public class faActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy ();
        ActivityCollector.removeActivity(this);
    }
}

After that, no matter where you are, just call ActivityCollector.finishAll(); method to exit the program

Note:

finish(): Ends the current Activity without immediately releasing the memory. Follow the android memory management mechanism.

System.exit();和android.os.Process.killProcess(android.osProcess.myPid());

End the current component such as Activity, and immediately release the resources occupied by the current Activity.

Online test of several exit methods:

public class BaseActivity extends Activity implements View.OnClickListener{

    public static void actionStart(Context context , String data1 , String data2){
        Intent intent = new Intent(context ,BaseActivity.class);
        intent.putExtra("name1" , data1 );
        intent.putExtra("name2" , data2);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.baseactivity);
        Button one = (Button) findViewById(R.id.one);
        Button two = (Button) findViewById(R.id.two);
        Button three = (Button) findViewById(R.id.three);
        Button four = (Button) findViewById(R.id.four);
        one.setOnClickListener(this);
        two.setOnClickListener(this);
        three.setOnClickListener(this);
        four.setOnClickListener(this);
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy ();
        ActivityCollector.removeActivity(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.one:
                android.os.Process.killProcess(android.os.Process.myPid());
//                killProcess
                break;
            case R.id.two:
                System.exit(0);
                break;
            case R.id.three:
                ActivityManager am = (ActivityManager)getSystemService (Context.ACTIVITY_SERVICE);
                am.restartPackage(getPackageName());
                break;
            case R.id.four:
                ActivityCollector.finishAll();
//                android.os.Process.killProcess(android.os.Process.myPid());
                break;
            default:
                break;
        }
    }
}

public class MainActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.activity_main);
        Button mbutton = (Button) findViewById(R.id.mbutton);
        mbutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                BaseActivity.actionStart(MainActivity.this , "data1" , "data2");
            }
        });
    }
}

Result: 1,2 will kill the current Activity and rebuild the MainActivity interface. 3 is invalid, 4 exits successfully.