Android：如果服务运行，则启动活动A，否则启动活动B

我在这方面遇到了麻烦，无法让它工作。这是空的主类别启动器活动的代码，如果服务未运行或用户未通过身份验证，则必须显示启动屏幕，否则启动对话活动

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;

public class EntryPoint extends Activity {
    private IAppManager imService;

    private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {

            imService = ((IMService.IMBinder) service).getService();

            // this is not starting activity :(

            // Start converstion activity if service running and user ok
            if (imService.isUserAuthenticated() == true) {
                try {
                    Intent i = new Intent(EntryPoint.this, Conversations.class);
                    startActivity(i);
                    finish();

                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }

        // this is not working

        // start login activity if service disconnected

        public void onServiceDisconnected(ComponentName className) {

            imService = null;

            try {
                Intent intent = new Intent(getBaseContext(), Splash.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                startActivity(intent);
                finish();

            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Start and bind the imService
        startService(new Intent(EntryPoint.this, IMService.class));
    }

    @Override
    protected void onPause() {

        super.onPause();

        try {
            unbindService(mConnection);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onResume() {

        super.onResume();

        try {

            bindService(new Intent(EntryPoint.this, IMService.class),
                    mConnection, Context.BIND_AUTO_CREATE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

当我运行应用程序时，既不运行

对话

，也不运行

启动

活动，但我看到的是空活动：（也没有错误，只运行空

入口点

活动，实际上应该启动其他活动之一

---

有人知道我做错了什么吗？

很可能您的服务没有连接，因此无法与您的活动交互

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;

public class EntryPoint extends Activity {
    private IAppManager imService;

    private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {

            imService = ((IMService.IMBinder) service).getService();

            // this is not starting activity :(

            // Start converstion activity if service running and user ok
            if (imService.isUserAuthenticated() == true) {
                try {
                    Intent i = new Intent(EntryPoint.this, Conversations.class);
                    startActivity(i);
                    finish();

                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }

        // this is not working

        // start login activity if service disconnected

        public void onServiceDisconnected(ComponentName className) {

            imService = null;

            try {
                Intent intent = new Intent(getBaseContext(), Splash.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                startActivity(intent);
                finish();

            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Start and bind the imService
        startService(new Intent(EntryPoint.this, IMService.class));
    }

    @Override
    protected void onPause() {

        super.onPause();

        try {
            unbindService(mConnection);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onResume() {

        super.onResume();

        try {

            bindService(new Intent(EntryPoint.this, IMService.class),
                    mConnection, Context.BIND_AUTO_CREATE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

单独创建一个intent，然后在startService&bindService分配它，而不是每次为startService&bindService创建一个新的intent实例

另外，为什么要在onResume（）上绑定服务？请查看此链接，了解您为什么应该尽可能避免这种情况-

---

您好，谢谢您的回答。我试过了，但它仍然显示空白活动，尽管没有错误。splash not conversation活动也没有启动。我不知道如何等待服务连接，然后执行以下操作：(