Android 如何从活动到小部件显示一个整数？

我必须在我的应用程序中添加活动。一个活动用于增加计数值，另一个活动扩展AppWidget。因为我需要定期在应用程序小部件中显示计数值（整数）

这是我的活动代码

Smoke_Count.java

package com.example.smokecount;

import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.TextView;

public class Smoke_Count extends Activity implements OnTouchListener{


    private Button btn;
    private TextView txt;
    private static int count=0;


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

        btn=(Button)findViewById(R.id.button1);
        txt=(TextView)findViewById(R.id.textView1);
        txt.setText(String.valueOf(count));
        btn.setOnTouchListener(this);
        loadInt();


    }


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


    @Override
    public boolean onTouch(View v, MotionEvent event) {
        // TODO Auto-generated method stub

        if(event.getAction()==MotionEvent.ACTION_UP)
        {
            loadInt();
            saveInt("countValue", count);
            count++;
            txt.setText(String.valueOf(count));
        }
        return true;
    }

    public void saveInt(String key,int count)
    {
        SharedPreferences share= PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        Editor edit= share.edit();
        edit.putInt(key, count);
        edit.commit();

    }

    public void loadInt()
    {
        SharedPreferences share= PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        int counter=share.getInt("countValue", count);
        /*Intent i=new Intent(Smoke_Count.this, Widget.class);
        i.putExtra("count", counter);
        sendBroadcast(i);*/
        txt.setText(String.valueOf(counter));

        if(counter>=count)
        {
            count=counter;
        }


    }

}

这是我的小部件活动

Widget.java

package com.example.smokecount;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class Widget extends AppWidgetProvider{



        @Override
        public void onUpdate(Context context, AppWidgetManager appWidgetManager,
                int[] appWidgetIds) {
            // TODO Auto-generated method stub
            super.onUpdate(context, appWidgetManager, appWidgetIds);



            for(int i=0;i<appWidgetIds.length;i++)
            {
                int appWidgetID=appWidgetIds[i];

                Intent i1=new Intent(Intent.ACTION_VIEW, null, context, Smoke_Count.class);
                PendingIntent pending=PendingIntent.getActivity(context, 0, i1, 0);

                RemoteViews views=new RemoteViews(context.getPackageName(), R.layout.activity_widget);
                views.setOnClickPendingIntent(R.id.imageButton1, pending);
                appWidgetManager.updateAppWidget(appWidgetID, views);
            }
        }

        /*@Override
        public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
            super.onReceive(context, intent);
            String action=intent.getAction();
        Bundle ext=intent.getExtras();
        int scount=ext.getInt("count");
        Toast.makeText(context, ""+scount, Toast.LENGTH_LONG).show();
        }*/

}

---

注释的区域是传递int的部分。因此您需要在Activty中输入extra（“key”，intValue），并在getIntent（）.getExtras（）.getInt（“key”）上的小部件中接收int

否则，您可以像以前一样使用SharedReferences获取Int

因此，让我们在活动中说：

Intent i=new Intent(Smoke_Count.this, Widget.class);
i.putExtra("count", counter);

在小部件中

Bundle bundle = getIntent().getExtras();
int yourInt = bundle.getInt("count", 0);

编辑

正如您已经使用过的，您应该使用给定的intent而不是getIntent（），这会导致NullpointerException，请执行以下操作：

Bundle bundle = intent.getExtras();
int yourInt = bundle.getInt("count", 0);

---

回答我先生@Pareshmayan在widget activity@mapocan中使用OnReceive方法时出错。你可以发布日志吗？你能告诉我widget.java中第42行有什么吗？这是第42行的代码int yourInt=bundle.getInt（“count”，0）@马波

Bundle bundle = getIntent().getExtras();
int yourInt = bundle.getInt("count", 0);

Bundle bundle = intent.getExtras();
int yourInt = bundle.getInt("count", 0);