Question

我有一个应用程序A，它使用以下代码调用另一个应用程序B的Activity。

    int request_code = 4;
    Intent i = new Intent();
    i.setClassName("name.of,packageB","class.name.of.packageB");
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivityForResult(i, request_code);

应用程序B中的目标活动已启动，此目标活动会产生另一项服务。

一旦此服务完成，我需要将结果返回给调用活动。

除了致电sendBroadcast(Intent)

之外，还有其他办法吗？

我有以下代码无效。对此有任何帮助表示赞赏。

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.activity_activity_main);

    String finish_activity="";
    try{
        Intent intent = getIntent();
        if(intent!=null && intent.getExtras()!=null)
        finish_activity = intent.getExtras().getString("finish_activity", "");
    }catch(Exception e){
        System.out.println(e.toString());
    }
    if(finish_activity.equals("")){
    Intent intent = new Intent(this, Service.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
    startService(intent);
    } else{

        ActivityManager am = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
        Intent i = new Intent();
        setResult(RESULT_OK,i);
        finish();
    }


}

我通过服务再次调用此Activity以返回无效的结果。调用我的目标活动的服务代码。

    Intent intent_finish = new Intent(context, TargetActivityName.class);
    intent_finish.putExtra("finish_activity", "true");
    intent_finish.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent_finish.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
    intent_finish.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    startActivity(intent_finish);

我没有在应用程序A中收到任何关于startActivityForResult的回调。对此有任何帮助。非常感谢。

我的两个应用程序的完整代码。申请A

public class AppA extends Activity {

private Button mOnBootBtn;
private Button mSettingsBtn;

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

}


protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if((requestCode == 4 )&& (resultCode==RESULT_OK)){
        System.out.println("result code = "+requestCode);
    }
};

public void simulate(View view){
    if(view.getId() == R.id.invoke){
            int request_code = 4;
            Intent i = new Intent();
            i.setClassName("com.example.AppB","com.example.AppB.Test");
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivityForResult(i, request_code);
    }
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, 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);
}
    }

申请B - Test.java

public class Test extends Activity {

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

String finish_activity="";
try{
    Intent intent = getIntent();
    if(intent!=null && intent.getExtras()!=null)
    finish_activity = intent.getExtras().getString("finish_activity", "");
}catch(Exception e){
    System.out.println(e.toString());
}
if(finish_activity.equals("")){
Intent intent = new Intent(this, Service.class);
intent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startService(intent);
} else{

    ActivityManager am = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
    Intent i = new Intent();
    setResult(RESULT_OK,i);
    finish();
}


}
@Override
protected void onSaveInstanceState(Bundle outState) {
    // TODO Auto-generated method stub
    super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onRestoreInstanceState(savedInstanceState);
}


}

申请表B- Service.java

public class Service extends Service {
public static Context context;
public static Intent receivedIntent;
public static String calling_intent;

@Override
public void onStart(Intent intent1, int startId) {
    // TODO Auto-generated method stub
    super.onStart(intent1, startId);
    System.out.println("Inside Service");
    if (NetworkAvailable(context)) {


            Intent intent_finish = new Intent(context, Test.class);
            intent_finish.putExtra("finish_activity", "true");
            intent_finish.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent_finish.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
            intent_finish.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

            startActivity(intent_finish);
    }

    }else{
        System.out.println("Inside service - No net");
    }


}
@Override
public IBinder onBind(Intent receivedIntent) {
    // TODO Auto-generated method stub

    return null;

}


private static boolean NetworkAvailable(Context context) {
ConnectivityManager connectivityManager;
try{
connectivityManager = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}catch(Exception e){
    System.out.println(e.toString());
    return false;
}


}


}

先谢谢。

Answer 1

我有点惊讶你的编译器没有抱怨额外的分号。但是你错过了你方法的@Override。您的整个方法签名应如下所示：

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if((requestCode == 4 )&& (resultCode==RESULT_OK)){
            System.out.println("result code = "+requestCode);
        }
    }

如何将结果返回给调用活动

1 个答案: