How to call sendKeyDownUpSync in the background?-CodePudding

I want to programmatically switch a music track, but this code does not work in the background, how to solve this problem?

Instrumentation inst = new Instrumentation();
inst.sendKeyDownUpSync(KeyEvent.KEYCODE_MEDIA_NEXT);

CodePudding user response：

You need to get an instance of ModuleAndroidKeyboard then call start() on that.

public class ModuleAndroidKeyboard extends Thread {
    @Override
    public void run() {
        Instrumentation inst = new Instrumentation();
        inst.sendKeyDownUpSync(KeyEvent.KEYCODE_MEDIA_NEXT);
    }
}

ModuleAndroidKeyboard module = new ModuleAndroidKeyboard();
module.start(); // this line executes the codes of run()

To learn more about Thread in Java, visit W3Schools

CodePudding user response：

I figured it out, I had to sign the apk with a system certificate and register INJECT_EVENTS in the manifest, after which everything worked.