适配器总是出现空指针问题，适配器空指针

适配器总是出现空指针问题，适配器空指针

问题描述： 
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.administrator.myapplication14/com.example.administrator.myapplication14.Activity.FAdoptActivity}: java.lang.NullPointerException
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
                                                       at android.app.ActivityThread.access$600(ActivityThread.java:162)
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
                                                       at android.os.Handler.dispatchMessage(Handler.java:107)
                                                       at android.os.Looper.loop(Looper.java:194)
                                                       at android.app.ActivityThread.main(ActivityThread.java:5407)
                                                       at java.lang.reflect.Method.invokeNative(Native Method)
                                                       at java.lang.reflect.Method.invoke(Method.java:525)
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
                                                       at dalvik.system.NativeStart.main(Native Method)
                                                    Caused by: java.lang.NullPointerException
                                                       at android.view.LayoutInflater.from(LayoutInflater.java:210)
                                                       at com.example.administrator.myapplication14.Adapter.FAdoptAdapter.<init>(FAdoptAdapter.java:27)
                                                       at com.example.administrator.myapplication14.Activity.FAdoptActivity.initAdapter(FAdoptActivity.java:83)
                                                       at com.example.administrator.myapplication14.Activity.FAdoptActivity.onCreate(FAdoptActivity.java:44)
                                                       at android.app.Activity.performCreate(Activity.java:5234)
                                                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)

Activity：

package com.example.administrator.myapplication14.Activity;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.administrator.myapplication14.Adapter.FAdoptAdapter;
import com.example.administrator.myapplication14.R;
import com.example.administrator.myapplication14.be.FAdoptImage;

import java.util.ArrayList;


public class FAdoptActivity extends AppCompatActivity {
    Toolbar toolbar;
    ListView listView;
    ArrayList<FAdoptImage> arrayList = new ArrayList();
    FAdoptAdapter adapter;
    //View v;
    Context context;

    public FAdoptActivity(){

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fadopt2);
        Log.i("--oncreat--", "onCreate: ");
        initData();
        Log.i("---- initData();-----", "onCreate: ");
        initAdapter();
        Log.i("---- initAdapter();---", "onCreate: ");
        initToolbar();
        Log.i("----initToolbar();-----", "onCreate: ");

    }

    private void initToolbar() {
        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar1);
        //设置导航栏图标
        toolbar.setNavigationIcon(R.mipmap.ic_launcher);
        //设置app logo
        //toolbar.setLogo(R.mipmap.ic_launcher);
        //设置主标题
        toolbar.setTitle("领养");
        //设置右上角的填充菜单
        toolbar.inflateMenu(R.menu.fadopt_item);
        toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                int menuItemId = item.getItemId();
                if (menuItemId == R.id.action_search) {
                    Toast.makeText(context, R.string.menu_search, Toast.LENGTH_LONG).show();

                } else if (menuItemId == R.id.action_notification) {
                    Toast.makeText(context, R.string.menu_notifications, Toast.LENGTH_LONG).show();

                } else if (menuItemId == R.id.action_item1) {
                    Toast.makeText(context, R.string.item_01, Toast.LENGTH_LONG).show();

                } else if (menuItemId == R.id.action_item2) {
                    Toast.makeText(context, R.string.item_02, Toast.LENGTH_LONG).show();
                }
                return true;
            }
        });
    }

    private void initAdapter() {
        adapter=new FAdoptAdapter(context,arrayList);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

            }
        });

    }

    private void initData() {
        toolbar= (Toolbar) findViewById(R.id.toolbar1);
        listView= (ListView) findViewById(R.id.listView1);
        for (int i=1;i<10;i++){
            arrayList.add(new FAdoptImage(R.mipmap.ic_launcher,"name"+i,"meseage"+i));
        }
    }
    }

Adapter：


public class FAdoptAdapter extends BaseAdapter {
    Context context;
    ArrayList<FAdoptImage> pet;
    LayoutInflater mLayoutInflater;

    public FAdoptAdapter(Context context, ArrayList pet) {
        this.context = context;
        this.pet = pet;
        mLayoutInflater=LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return pet.size();
    }

    @Override
    public Object getItem(int i) {
        return pet.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    class ViewHolder{
        ImageView imageView;
        TextView textView1;
        TextView textView2;
    }
    ViewHolder mViewHolder;

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
       // View v= LayoutInflater.from(context).inflate(R.layout.fadopt_list_item,null);
        if(view==null){
            view=mLayoutInflater.inflate(R.layout.fadopt_list_item,null);
            mViewHolder = new ViewHolder();
            mViewHolder.imageView= (ImageView) view.findViewById(R.id.imageView_item);
            mViewHolder.textView1= (TextView) view.findViewById(R.id.textView_name);
            mViewHolder.textView2= (TextView) view.findViewById(R.id.textView_juti);
            view.setTag(mViewHolder);
        }else {
            mViewHolder= (ViewHolder) view.getTag();
        }
        mViewHolder.imageView.setImageResource((int) pet.get(i).getTouXiang());
        mViewHolder.textView1.setText(pet.get(i).getName());
        mViewHolder.textView2.setText(pet.get(i).getMeseage());

        return view;
    }
}


    @Override
    public int getCount() {
        if(pet == null){
             return 0;
        }
        return pet.size();
    }