Diese Handler-Klasse soll statisch sein oder Undichtigkeiten auftreten (com.test."test3".ui.MainActivity.1)

Ich bin neu auf android und ich versuche ein system zu entwickeln, aber wenn ich fertig bin code die handler zeigen diese Warnung

unten zeigen den code, nachdem ich Bearbeiten, den handler in der event-ontounch zeigen Sie das Warnung-handler nicht behoben werden kann. Ich versuchen Sie, //zu ignorieren, die handler versuche ich die Anwendung ausführen, und das Ergebnis in Kraft in der Nähe.

public class MainActivity extends Activity {



protected static final int STOP = 100;
ImageView iv;
private ProgressBar pb;
LinearLayout ll;
private AnimationDrawable anim;
ScrollView sv;
private SQLiteDatabase db;
private boolean flagscanning = false;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ll = new LinearLayout(this);
    new HandlerClass(this);

            db = SQLiteDatabase.openDatabase(Environment.getExternalStorageDirectory()+"/antivirus.sqlite", null, SQLiteDatabase.OPEN_READONLY);  
            iv = (ImageView) this.findViewById(R.id.imageView1);
                    //扫描病毒进度条
            pb = (ProgressBar) this.findViewById(R.id.progressBar1);
            ll = (LinearLayout) this.findViewById(R.id.ll);
                    //设置ImageView背景资源为动画文件
            iv.setBackgroundResource(R.drawable.bg);
                    //sv用来显示病毒的扫描结果
            sv = (ScrollView) this.findViewById(R.id.scrollView1);
            anim = (AnimationDrawable) iv.getBackground();
}

private static class HandlerClass extends Handler{
    private final WeakReference<MainActivity> mTarget;
    public HandlerClass(MainActivity context){
        mTarget = new WeakReference<MainActivity>((MainActivity) context);
    }

    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        MainActivity target = mTarget.get();
         if(msg.what==STOP){
             target.ll.removeAllViews();
             //anim.stop();

             }
         String str = (String) msg.obj; 
         TextView tv = new TextView(target);
         tv.setText(str);
         target.ll.setOrientation(LinearLayout.VERTICAL);
         target.ll.addView(tv);
         //sv.scrollBy(0, 20);

        System.out.println(str);

    }
};


@Override
public boolean onTouchEvent(MotionEvent event) {
    //如果程序正在杀毒过程中，拒绝再次启动杀毒线程
    if(flagscanning){
        return false;
    }

    //如果用户触摸屏幕，则开启杀毒线程  
    if (event.getAction() == MotionEvent.ACTION_UP) {
        flagscanning= true;
        anim.start();
        new Thread() {
            public void run() {
                //获取每一个应用程序的签名，签名须与数据库的签名想比较
                List<PackageInfo> infos = getPackageManager()
                        .getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES | PackageManager.GET_SIGNATURES);
                //设置进度条的扫描范围
                pb.setMax(infos.size());
                int total = 0;
                int virustotal = 0;//设置初始病毒数为0
                for (PackageInfo info : infos) {
                    total++;
                    try {
                        sleep(20);//只为便于观察扫描效果和进度，无实质作用
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    Message msg = Message.obtain();
                    msg.obj = "正在扫描" + info.packageName;
                    _handler.sendMessage(msg);_
                    Signature[] signs = info.signatures;
                    String str = signs[0].toCharsString();

                    String md5 = MD5Encoder.encode(str);
                    //将应用程序签名与数据库中保存的签名进行比较，如果相一致，则使病毒数加1，并通过handler在界面显示病毒包名
                    Cursor cursor = db.rawQuery("select desc from datable where md5=?",new String[] { md5 });
                    if (cursor.moveToFirst()) {
                        String desc = cursor.getString(0);
                        msg = Message.obtain();
                        msg.obj = info.packageName + ": " + desc;
                        _handler.sendMessage(msg);_
                        virustotal++;
                    }
                    cursor.close();
                    pb.setProgress(total);

                }
                Message msg = Message.obtain();
                msg.what = STOP;
                msg.obj = "扫描完毕 ,共发现" + virustotal + "个病毒";
                _handler.sendMessage(msg);_
                flagscanning = false;
                pb.setProgress(0);
            };
        }.start();
    }
    return super.onTouchEvent(event);
}

@Override
protected void onDestroy() {
    if (db.isOpen())
        db.close();
    super.onDestroy();
}

@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;
}
}