java - Android-当我尝试在文本框中显示某些内容时崩溃

Question

public void onClick_Start(View v) {
    //stores the weight value entered by user
    final EditText sWeight = (EditText) findViewById(R.id.editTextWeight);
    Log.v("EditText", sWeight.getText().toString());
    String w = sWeight.getText().toString();
    Weight_double = Double.parseDouble(w);
    //sets to true because start was clicked
    start = true;
    counter = 0;
    final int x1 = (int)lowX;
    final int y1 = (int)lowY;
    final int z1 = (int)lowZ;

    new Thread(new Runnable() {
        public void run() {
            int x2;
            int y2;
            int z2;
            int x3 = 10000;

           while(start)
           {
               x2 = (int)lowX;
               y2 = (int)lowY;
               z2 = (int)lowZ;
               if(x2 != x3)
               {
                   if(x2 == x1&& y2 ==y1 && z2 == z1) {
                       counter++;
                       tv.setText(counter);
                   }
               }
               x3 = x2;
           }
        }
    }).start();
}

-X、Y 和 Z 指的是加速度计的值 - 该方法应该在单击按钮时启动 - 计数器变量用于对特定的移动进行计数 - 我认为这可能是一个线程问题，但我不确定

Answer 1

您无法从另一个线程访问 UI 元素。尝试像这样在 UI 线程中运行代码。将 tv.setText(counter) 替换为以下代码。

YourActivity.this.runOnUiThread((new Runnable() {
    public void run() {
        tv.setText(counter);
    }
});