Question

我想保存用户活动的详细信息，即使他通过按后退按钮或更改方向关闭了应用程序。我使用了共享预防但我不知道它是如何工作的。我在不同的程序中看到了使用sharepreferences保存数据。但我不能这样做。我必须做任何改变。这是我的代码：

package tmt.niranjan.travellingtrack;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.ActivityRecognitionClient;

public class MainActivity extends Activity implements GooglePlayServicesClient.ConnectionCallbacks,GooglePlayServicesClient.OnConnectionFailedListener {

private ActivityRecognitionClient arclient;
private PendingIntent pIntent;
private BroadcastReceiver receiver;
private TextView tvActivity;
public static final String SHARED_PREFERENCES =
        "tmt.niranjan.travellingtrack.SHARED_PREFERENCES";
 public static final String KEY_LOG_FILE_NUMBER =
            "tmt.niranjan.travellingtrack.KEY_LOG_FILE_NUMBER";
  public static final String KEY_LOG_FILE_NAME =
            "tmt.niranjan.travellingtrack.KEY_LOG_FILE_NAME";
  public static final String KEY_LOG_FILE_NAME1 =
            "tmt.niranjan.travellingtrack.KEY_LOG_FILE_NAME";
  public static final String KEY_PREVIOUS_ACTIVITY_TYPE =
            "tmt.niranjan.travellingtrack.KEY_PREVIOUS_ACTIVITY_TYPE";
private SharedPreferences mpref;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tvActivity = (TextView) findViewById(R.id.Actrec);
    mpref = getApplicationContext().getSharedPreferences(
            SHARED_PREFERENCES, Context.MODE_PRIVATE);

    int resp =GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
    if(resp == ConnectionResult.SUCCESS){
        arclient = new ActivityRecognitionClient(this, this, this);
        arclient.connect();


    }
    else{
        Toast.makeText(this, "Please install Google Play Service.", Toast.LENGTH_SHORT).show();
    }

    receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Editor editor = mpref.edit();
            String v =  "Type:"+intent.getExtras().getInt("Type")+" "+"Activity :" + intent.getStringExtra("Activity") + " " + "Confidence : " + intent.getExtras().getInt("Confidence") + "\n";
            editor.putInt(KEY_PREVIOUS_ACTIVITY_TYPE,intent.getExtras().getInt("Type"));
            editor.putString(KEY_LOG_FILE_NAME, "Activity");
            editor.putInt(KEY_LOG_FILE_NUMBER, intent.getExtras().getInt("Confidence"));
            editor.putString(KEY_LOG_FILE_NAME1,v);



            tvActivity.setText(v);

            editor.commit();
        }
      };

     IntentFilter filter = new IntentFilter();
     filter.addAction("tmt.niranjan.myactivityrecognition.ACTIVITY_RECOGNITION_DATA");
     registerReceiver(receiver, filter);

}


@Override
protected void onDestroy() {
    super.onDestroy();
    if(arclient!=null){
        arclient.removeActivityUpdates(pIntent);
        arclient.disconnect();
    }
    Toast.makeText(this, "ondestroycalled", Toast.LENGTH_SHORT).show();
    unregisterReceiver(receiver);
}

@Override
public void onConnectionFailed(ConnectionResult arg0) {
    Toast.makeText(this, "Connection Failed", Toast.LENGTH_SHORT).show();
}
@Override
public void onConnected(Bundle arg0) {
    Intent intent = new Intent(this, ActivityRecognitionService.class);
    pIntent = PendingIntent.getService(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);
    arclient.requestActivityUpdates(1000, pIntent);   
}
@Override
public void onDisconnected() {
}

}

Answer 1

你缺少editor.apply（）;在editor.commit（）;

之前

试一试，看看它是否有效

这是我使用并且工作正常的代码，所以如果它不是editor.apply那么它会建议你的intents.getextra没有设置任何东西，你调试过它们是否包含值？

SharedPreferences.Editor editor = prefs.edit();
            editor.putString("key_pref_branch_code", mainObject.getString("Code"));
            editor.putString("key_pref_branch_id", mainObject.getString("ID"));
            editor.putString("key_pref_branch_name", mainObject.getString("Name"));
            editor.putString("key_pref_json_url", "http://xxxxx:8080/storehandler.ashx");
            editor.apply();
            editor.commit();

在活动识别应用中使用共享首选项

1 个答案: