【Android】Unable to start receiver的问题空指针

Question

模拟器跑的时候没问题 手机运行就出现以下问题

Answer 1

package www.csy.com.adress;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;

public class NetworkConnectChangedReceiver extends BroadcastReceiver {

public NetEvevt evevt = BaseActivity.evevt;

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
        int netWorkState = NetUtil.getNetWorkState(context);
        // 接口回调传过去状态的类型
        evevt.onNetChange(netWorkState);
    }
}

// 自定义接口
public interface NetEvevt {
    public void onNetChange(int netMobile);
}

}

---

package www.csy.com.adress;

import android.Manifest;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.example.getlocation.R;

import java.io.IOException;
import java.util.List;

public class Adress extends BaseActivity {

private TextView postionView;
private LocationManager locationManager;
public String locationProvider;
public String str;
public double jingdu;
public double weidu;
public String id = null;
public SQLiteDatabase db = null;

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

    Button bt1 = (Button) findViewById(R.id.bt1);
    bt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            /**
             * 清空轻量级储存器
             * */
            SharedPreferences sharedPreferences = getSharedPreferences("userinfo", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = sharedPreferences.edit();
            editor.remove("uname");
            editor.remove("upswd");
            editor.commit();
            Intent intent = new Intent(Adress.this, MainActivity.class);
            startActivity(intent);
        }
    });

    //获取显示地理位置信息的TextView
    postionView = (TextView) findViewById(R.id.positionView);
    //获取地理位置管理器
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    //获取所有可用的位置提供器
    List<String> providers = locationManager.getProviders(true);
    if (providers.contains(LocationManager.GPS_PROVIDER)) {
        //如果是GPS
        locationProvider = LocationManager.GPS_PROVIDER;
    } else if (providers.contains(LocationManager.NETWORK_PROVIDER)) {
        //如果是Network
        locationProvider = LocationManager.NETWORK_PROVIDER;
    } else {
        Toast.makeText(this, "没有可用的位置提供器", Toast.LENGTH_SHORT).show();
        return;
    }
    //获取Location
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    Location location = locationManager.getLastKnownLocation(locationProvider);
    if (location != null) {
        //不为空,显示地理位置经纬度
        try {
            showLocation(location);

            /**
             *与服务器开始连接
             */
            id = getIntent().getStringExtra("id");
            Double jingdu1 = location.getLongitude();
            Double weidu1 = location.getLatitude();
            mWebSocket MW = new mWebSocket();
            MW.connect(id, jingdu1, weidu1);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //监视地理位置变化
    locationManager.requestLocationUpdates(locationProvider, 60 * 1000/*1s*/, 1/*1米*/, locationListener);

}

/**
 * 显示地理位置经度和纬度信息
 */

private void showLocation(Location location) throws IOException {
    id = getIntent().getStringExtra("id");
    weidu = location.getLatitude();
    jingdu = location.getLongitude();

    String locationStr = "维度：" + location.getLatitude() + "\n"
            + "经度：" + location.getLongitude();
    postionView.setText(locationStr);


    /**
     * 如果网络可用。。。。。
     * 如果网络不可用。。。。
     */

    if (isNetworkAvailable.panduanwangluo(this)) {
        L.e("网络可用");
        str = new Gettime().getTime();
        try {
            if (HttpUtils.httpurl(id, jingdu, weidu, str)) {
                Toast.makeText(Adress.this, "成功上传数据库", Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            Toast.makeText(Adress.this, "失败！！！", Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }

    } else {
        L.e("没有网络");
        onNetChange(NetUtil.NETWORK_NONE);
    }
}

/**
 * LocationListern监听器
 * 参数：地理位置提供器、监听位置变化的时间间隔、位置变化的距离间隔、LocationListener监听器
 */

LocationListener locationListener = new LocationListener() {

    @Override
    public void onStatusChanged(String provider, int status, Bundle arg2) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

    @Override
    public void onLocationChanged(Location location) {
        //如果位置发生变化,重新显示
        try {
            showLocation(location);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
};

public void onNetChange(int netMobile) {
    // TODO Auto-generated method stub
    //在这个判断，根据需要做处理
    if (netMobile == NetUtil.NETWORK_NONE) {
        Toast.makeText(this, "网络断开", Toast.LENGTH_SHORT).show();
        L.e("网络断开");
        str = new Gettime().getTime();//获得时间

        db = openOrCreateDatabase("address", MODE_PRIVATE, null);
        db.execSQL("create table if not exists stutb(_id integer primary key autoincrement," +
                "id text not null,lon text not null,lat text not null,time text not null)");

        ContentValues values = new ContentValues();
        values.put("id", id);
        values.put("lon", jingdu);
        values.put("lat", weidu);
        values.put("time", str);
        db.insert("stutb", null, values);
        Toast.makeText(this, "数据已插入", Toast.LENGTH_SHORT).show();
        values.clear();

    } else {
        Toast.makeText(this, "网络已连接", Toast.LENGTH_SHORT).show();
        L.e("网络已连接");
        Cursor c = db.query("stutb", null, null, null, null, null, null);
        if (c != null) {
            while (c.moveToNext()) {
                String id = c.getString(c.getColumnIndex("id"));
                Double lon = c.getDouble(c.getColumnIndex("lon"));
                Double lat = c.getDouble(c.getColumnIndex("lat"));
                String time = c.getString(c.getColumnIndex("time"));
                if (HttpUtils.httpurl(id, lon, lat, time)) {
                    Toast.makeText(this, "数据已上传", Toast.LENGTH_SHORT).show();
                    db.delete("stutb", "id=?", new String[]{id});
                }
                Toast.makeText(this, id + lon + lat + time, Toast.LENGTH_SHORT).show();
            }

// db.execSQL("DROP stutb");
Toast.makeText(this, "数据已清空", Toast.LENGTH_SHORT).show();
c.close();
}
db.close();
}
}

@Override
protected void onDestroy() {

    super.onDestroy();
    if (locationManager != null) {
        //移除监听器
        if (ActivityCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        locationManager.removeUpdates(locationListener);
    }
}

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

}