我正在尝试将String []发送到另一个类的内部类中的线程(如果这有意义)。 然后我想用String []做一些工作然后将它输出回UI。但我不确定如何做到这一点?我还使用了什么消息,以便我可以控制在UI中执行的操作。
继承我的MainActivity
:
public class MainActivity extends Activity implements OnClickListener {
EditText cl;
TextView info;
Button enter;
Button line;
Button arc;
Line callLine = new DrawingUtils.Line();
Enter callEnter = new DrawingUtils.Enter();
Arc callArc = new DrawingUtils.Arc();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
info = (TextView) findViewById(R.id.info);
enter = (Button) findViewById(R.id.enter);
line = (Button) findViewById(R.id.line);
arc = (Button) findViewById(R.id.arc);
cl = (EditText) findViewById(R.id.editText1);
Handler uiHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
}
}
};
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.enter:
String in = cl.getText().toString();
String[] Input = in.split(",");
// I would like to send Input[] to the line Thread in DrawingUtils
callEnter.start();
break;
case R.id.line:
callLine.start();
break;
case R.id.arc:
callArc.start();
break;
}
};
}
继承了具有Thread
public class DrawingUtils {
// Thread classes for buttons
public static class Line extends Thread {
Thread line = new Thread() {
public void run() {
Looper.prepare();
Handler lineHandler = new Handler() {
public void handleMessage(Message msg) {
// How to get Input from Enter button to use in thread
}
};
Looper.loop();
// Then I need to do some work
// Then Send the worked data back to the uiHandler in
// oncreate().
}
};
}
我正在使用处理程序,他们似乎对我的代码有用。当有人点击Line它会设置一个textview说(INPUT POINT1)然后线程将等待,当用户输入x,y,z到edittext并单击Enter时,输入将被放入一个字符串,然后用逗号分隔并放入到一个字符串数组,它将处理行线程,然后在进入代码的末尾,将调用notifyAll()以允许行线程继续并请求下一个输入。在线程结束时,它将被处理回UI线程
答案 0 :(得分:3)
为什么要使用处理程序?我会使用带有参数的AsyncTask
,它们在大多数情况下都是完美的,就像你的。请看:http://developer.android.com/reference/android/os/AsyncTask.html
我会尝试这个(MyAsyncTask
是您的Activity类的子类):
private class MyAsyncTask extends AsyncTask<String[], Void, Boolean> {
//declare here local variables
@Override
protected void onPreExecute() {
super.onPreExecute();
//prepare your local variables for the computation
}
@Override
protected Boolean doInBackground(String[]... arg0) {
String[] myStringArray = arg0[0];
// make your manipulation of myStringArray
return null; // return the result and set your local variable
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
//update ui using result and/or local variable
}
}
从点击事件中,您可以调用以下内容:
String[] strings = {"1", "2", "3"};
new MyAsyncTask().execute(strings);
我想提醒您有关您的代码:
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.enter:
String in = cl.getText().toString();
String[] Input = in.split(",");
// I would like to send Input[] to the line Thread in DrawingUtils
callEnter.start();
break;
case R.id.line:
callLine.start();
break;
case R.id.arc:
callArc.start();
break;
}
};
变量Input
仅在第一种情况下初始化,如果案例陈述选择R.id.line
或R.id.arc
您遇到麻烦......