安卓处理程序 : Send 8 different messages: handler finds 8 messages but only used the last message

Question

我是 Android 的新手，发现要不断更新主视图，我必须创建一个线程来处理各种进程，然后将更新传回主视图。我决定使用 Handler 类来执行此操作。此示例中的 View 有一个用于激活代码的按钮和一个用于显示收到的消息的表格布局 - 表示流程的一个阶段。

问题是我发送了 8 条不同的消息，我可以在处理程序中看到 8 条消息返回，但所有 8 条消息的内容都与消息 8 相同。

我期待处理程序按顺序接收消息。

任何关于更好的方法的建议总是欢迎学习。

代码如下:

`

public class messageHandlerTest extends Activity {

protected TextView textView;
protected Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            String[] status = (String[]) msg.obj;
            createTableRow(status);
            Log.e("Got a new message",status[0]+":"+status[1]);
        }
    };

Button btnStartProgress;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView = (TextView) findViewById(R.id.statusText);
    textView.setText("");
    //Getting response from server with Network SSID and Password

    Button connectButton = (Button)findViewById(R.id.connectButton);
    addListenerOnButton();
} // End of create

protected class connectWiFi extends Thread implements Runnable {
    //tokens1 = new String[0];
    public void run(){
    try {
        String[] messageString = new String[2];
        Message message = handler.obtainMessage();
        messageString[0]="OK";
        messageString[1]="Number 1";
        message.obj = messageString;
        handler.sendMessage(message);

        message = handler.obtainMessage();
        messageString[0]="OK";
        messageString[1]= "Number 2";
        message.obj = messageString;
        handler.sendMessage(message);
        message = handler.obtainMessage();
        messageString[0]="OK";
        messageString[1] = "Number 3";
        message.obj = messageString;
        handler.sendMessage(message);
        message = handler.obtainMessage();
        messageString[0]="OK";
        messageString[1] = "Number 4";
        message.obj = messageString;
        handler.sendMessage(message);

                    message = handler.obtainMessage();
                    messageString[0] = "OK";
                    messageString[1] = "Number 5";
                    message.obj = messageString;
                    handler.sendMessage(message);

                    message = handler.obtainMessage();
                    messageString[0] = "OK";
                    messageString[1] = "Number 6";
                    message.obj = messageString;
                    handler.sendMessage(message);

                    message = handler.obtainMessage();
                    messageString[0] = "OK";
                    messageString[1] = "Number 7";
                    message.obj = messageString;
                    handler.sendMessage(message);

                    message = handler.obtainMessage();
                    messageString[0] = "OK";
                    messageString[1] = "Number 8";
                    message.obj = messageString;
                    handler.sendMessage(message);

    } catch (Exception e) {
        e.printStackTrace();
        Log.e("Exception found","bugger");
    }
    }// End or run
}// End of class

public void addListenerOnButton() {

    btnStartProgress = (Button) findViewById(R.id.connectButton);
    btnStartProgress.setOnClickListener(
            new OnClickListener() {
                @Override
                public void onClick(View v) {
                connectWiFi connectwifi = new connectWiFi();
                connectwifi.start();
                }

            });

}
private void createTableRow(String[] stage) {
    TableLayout tl = (TableLayout) findViewById(R.id.statusTable);
    TableRow tr = new TableRow(this);
    LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
    tr.setLayoutParams(lp);
    tr.setBackgroundColor(0xFFFFFFFF);
    TextView tvStatus = new TextView(this);
    tvStatus.setLayoutParams(lp);
    tvStatus.setPadding(2,1,1,2);
    tvStatus.setTextColor(0xFF000000);
    tvStatus.setText(stage[0]); // Status
    TextView tvStage = new TextView(this);
    tvStage.setLayoutParams(lp);
    tvStage.setPadding(2,1,1,2);
    tvStage.setTextColor(0xFF000000);
    tvStage.setText(stage[1]); // Stage
    tr.addView(tvStatus);
    tr.addView(tvStage);
    tl.addView(tr, new TableLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
}
@Override
protected void onDestroy() {
    super.onDestroy();
}

这段代码的结果如下:

Answer 1

要通过处理程序发送数据，您可以使用 bundle 作为要发送给处理程序的消息对象的数据。像这段代码:

// receieve message in handleMessage method of handler of your controller (e.g. on UI thread)
handler = new Handler() { 
    @Override
    public void handleMessage(Message msg) {
        Bundle b = msg.getData();
        Integer value = b.getInt("KEY");
        ...
    }
};

// Sending message in a background thread
new Thread(new Runnable() {
    @Override
    public void run() {
        final Message msg = new Message();
        final Bundle b = new Bundle();
        Integer value = 1;
        b.putInt("KEY", value);
        msg.setData(b);
        handler.sendMessage(msg);    
    }
).start();