Question

我在android中有处理程序的问题，我不明白不显示结果，这是代码：

public class Main extends Activity implements OnClickListener {

private EditText nhap;
private Button btTinh;
private Button btHuy;
private TextView kq;
private ProgressDialog progress;
private Handler handle = new Handler();
private int count = 0;
private String s = "";
private long n;

的handleMessage：

Handler mhandle = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        kq.setText(msg.obj.toString());
    }
};

的onCreate：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    nhap = (EditText) findViewById(R.id.nhap);
    btTinh = (Button) findViewById(R.id.btTinh);
    btHuy = (Button) findViewById(R.id.btHuy);
    kq = (TextView) findViewById(R.id.kq);
    btTinh.setOnClickListener(this);
    btHuy.setOnClickListener(this);
}   

public boolean checkPrime(long n) {
    for (int i = 2; i <= Math.sqrt(n); i++) {
        if (n % i == 0)
            return false;
    }
    return true;
}

outprime：

public void outPrime(long t) {
    // String s="";
    progress.setCancelable(true);
    progress.setMessage("File downloading ...");
    progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
    progress.setProgress(0);
    progress.setMax(Integer.parseInt(nhap.getText().toString()));
    progress.show();
    n = t;
    new Thread() {
        public void run() {
            for (int i = 2; i < n; i++) {
                count = i;
                if (checkPrime(i))
                    s = s + i + " ";
                handle.post(new Runnable() {

                    public void run() {
                        // TODO Auto-generated method stub
                        progress.setProgress(count);
                    }
                });


            }
            if (count == n - 1) {
                progress.dismiss();
                Message msg = handle.obtainMessage(1, (String)s);
                handle.sendMessage(msg);
            }

        }
    }.start();


}

的onclick：

public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.btTinh:
        progress = new ProgressDialog(this);
        outPrime(Long.parseLong(nhap.getText().toString()));
        break;
    case R.id.btHuy:
        nhap.setText("");
        break;
    }
}}

这是handlemessage：

Handler mhandle = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        kq.setText(msg.obj.toString());
    }
};

我不明白handlemessage不返回值，“kq.setText（msg.obj.toString（））;”不显示到屏幕，抱歉，因为我的英语不好

Answer 1

我认为你的问题的答案是“注意你变量的名字！”看 - 你创建了2个处理程序 - 名为“mhandle”和“handle”。您想在Handler中解析名为“mhandle”的消息，但在您的Thread中将其发送到“handle”，这对您的代码没有任何作用。希望如果你仍然想找到答案，它会有所帮助。

为什么处理消息不起作用

1 个答案: