Question

我有一个实现以下回调方法的服务。

public bound = false;

@Override
public IBinder onBind(Intent intent) {
    bound = true;
    return mBinder;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return Service.START_NOT_STICKY;
}
@Override
public boolean onUnbind(Intent intent) {
    bound = false;
    return true;
}
@Override
public void onRebind(Intent intent) {
    bound = true;

}
@Override
public void onDestroy() {
//super.onDestroy();   

}

在我的活动中，我有以下三个按钮点击代码。

if(v.getId() == R.id.bind)
{
    Intent intent = new Intent(this, LocalService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);                
}
else if(v.getId() == R.id.unbind)
{
    unbindService(mConnection);
}
else if (v.getId() == R.id.rebind)
{
    Intent intent = new Intent(this, LocalService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

我首先绑定，取消绑定然后调用rebind。在绑定和重新绑定的情况下，调用onCreate()和onBind()服务方法。永远不会调用onRebind()。我错过了什么吗？

Answer 1

您可以按照以下步骤操作：

点击“启动服务”，然后使用活动中的startService（）方法启动服务。按钮。
使用活动中的bindService（）方法绑定服务，方法是点击“绑定服务”＆＃39;按钮。
点击＆＃39;取消绑定服务＆＃39;从活动中使用unbindService（）方法取消绑定服务按钮。
再次点击“绑定服务”＆＃39;按钮，然后活动调用onRebind（）方法。

示例代码：

MyService.java

package com.example.service_lifecycle;

public class MyService extends Service {

    @Override
    public void onCreate() {
        Toast.makeText(getApplicationContext(), "I am in on create method.", Toast.LENGTH_SHORT).show();
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(getApplicationContext(), "I am in on start command method. " + mStartMode, Toast.LENGTH_SHORT).show();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        Toast.makeText(getApplicationContext(), "I am in on bind method. " + mBinder, Toast.LENGTH_SHORT).show();
        return null;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Toast.makeText(getApplicationContext(), "I am in on unbind method. " + mAllowRebind, Toast.LENGTH_SHORT).show();
        return true;
    }

    @Override
    public void onRebind(Intent intent) {
        Toast.makeText(getApplicationContext(), "I am in on rebind method.", Toast.LENGTH_SHORT).show();
        super.onRebind(intent);
    }

    @Override
    public void onDestroy() {
        Toast.makeText(getApplicationContext(), "I am in on destroy method.", Toast.LENGTH_SHORT).show();
        super.onDestroy();
    }
}

ServiceLifeCycleActivity.java

package com.example.service_lifecycle;



import com.example.androidpractice.R;

public class ServiceLifeCycleActivity extends ActionBarActivity implements OnClickListener{

    private Button btnStartService;
    private Button btnStopService;
    private Button btnBindService;
    private Button btnUnbindService;

    private boolean isServiceBind = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_service_life_cycle);

        btnStartService = (Button)findViewById(R.id.btnStartService);
        btnStartService.setOnClickListener(this);

        btnStopService = (Button)findViewById(R.id.btnStopService);
        btnStopService.setOnClickListener(this);

        btnBindService = (Button)findViewById(R.id.btnBindService);
        btnBindService.setOnClickListener(this);

        btnUnbindService = (Button)findViewById(R.id.btnUnbindService);
        btnUnbindService.setOnClickListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.service_life_cycle, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnStartService:          
            startService(new Intent(this, MyService.class));
            break;

        case R.id.btnStopService:
            stopService(new Intent(this, MyService.class));
        break;

        case R.id.btnBindService:
            bindService(new Intent(this, MyService.class), mServiceConnection, Context.BIND_AUTO_CREATE);
            isServiceBind = true;
            break;

        case R.id.btnUnbindService:
            if(isServiceBind){
                if(mServiceConnection != null){
                    unbindService(mServiceConnection);
                }           
                isServiceBind = false;
            }
            else{
                Toast.makeText(this, "Service is not bound.", Toast.LENGTH_SHORT).show();
            }
            break;

        default:
            break;
        }
    }

    // Code to manage Service lifecycle.
        private ServiceConnection mServiceConnection = new ServiceConnection() {                    
            @Override
            public void onServiceConnected(ComponentName comName, IBinder service) {
            }

            @Override
            public void onServiceDisconnected(ComponentName comName) { 

            }       
        }; 
}

res/layout/activity_service_life_cycle.xml


    <Button
        android:id="@+id/btnStartService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Start Service" />

    <Button
        android:id="@+id/btnStopService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btnStartService"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="19dp"
        android:text="Stop Service" />

    <Button
        android:id="@+id/btnBindService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/btnStopService"
        android:layout_below="@+id/btnStopService"
        android:layout_marginTop="18dp"
        android:text="Bind Service" />

    <Button
        android:id="@+id/btnUnbindService"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/btnBindService"
        android:layout_centerVertical="true"
        android:text="Unbind Service" />

如果您有任何疑问，请与我联系。

感谢。

服务onRebind（）没有被调用

1 个答案: