我在 onClick 事件方法上的方法没有做任何事情

Question

我正在做一个安卓项目

1. 在MainActivity 上创建一个方法，如下所示：

   public void diagnose(View View) {
   
       System.out.println("%%%%%%%%%%%%%%%%% INSIDE DIAGNOSE %%%%%%%%%%%%%%");
   
       String PTCondition = " ";
   
       int row, col, count, percentageOfLikelihood, maxPercent = 0;
   
       //To store the name of each condition and its percentage of likelihood
       String[][] percentPerCondition = new String[8][];
   
       percentPerCondition[0][0] = "Rotator Cuff Strain";
       percentPerCondition[1][0] = "Coracoid Impingement";
       percentPerCondition[2][0] = "Supraspinatus Impingement";
       percentPerCondition[3][0] = "Bicipital Tendonitis";
       percentPerCondition[4][0] = "Glenohumeral Dislcation";
       percentPerCondition[5][0] = "Clavicular Fracture";
       percentPerCondition[6][0] = "Labral Tear";
       percentPerCondition[7][0] = "SubAcromial Bursitis";
   
       //Store binary sequence of Special Tests that correspond to the conditions above
       int[][] STValuesPercondition = new int[][] {
           {
               1, 0, 1, 0, 1
           }, {
               0, 1, 0, 1, 1
           }, {
               0, 1, 1, 0, 0
           }, {
               1, 1, 0, 0, 1
           }, {
               0, 0, 1, 1, 1
           }, {
               1, 1, 0, 1, 0
           }, {
               1, 0, 1, 1, 0
           }, {
               0, 1, 1, 1, 0
           }
       };
   
       //Compare the binary sequence in PTFindings to all conditions
       for (row = 0; row < STValuesPercondition.length; row++) {
           count = 0;
           for (col = 0; col < STValuesPercondition.length; col++) {
               if (STValuesPercondition[row][col] == PTFindings[row]) count++;
           }
   
           //Calculate percentage of likelihood
           percentageOfLikelihood = (count / 5) * 100;
           if (percentageOfLikelihood > maxPercent) {
               maxPercent = percentageOfLikelihood;
               PTCondition = percentPerCondition[row][0];
           }
   
           System.out.println("&&&&&&& Inside diagnosis: " + PTCondition);
           //Store percentage as a String in the percentPerCondition 2D array; may need it later
           percentPerCondition[row][1] = Integer.toString(percentageOfLikelihood);
       }
   
       //Point to the TextView where data to be displayed - in layout file (displaydx)
       DxTextView = (TextView) findViewById(R.id.dx1);
   
       //Populate the textView with the data from
       DxTextView.setText(PTCondition);
   
       //Display the PTCondition on the activity
       String passPTCondition = "";
   
       Intent i = new Intent(getApplicationContext(), DisplayDxActivity.class);
       i.putExtra(passPTCondition, PTCondition);
       startActivity(i);
   
   } //public void diagnose(View View)
   

2. 这是我的布局文件；似乎没有调用该方法（ diagnostic(View View) ）。我的 diagnostic() 方法在 onCreate() 中定义 当我点击诊断时没有任何反应？ ！！！！

   <Button
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Generate Possible Diagnoses"
       android:id="@+id/SubmitButton"
       android:textColor="#ffff6949"
       android:background="#ffffffff"
       android:textStyle="bold"
       android:onClick="diagnose" />
   
   <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textAppearance="?android:attr/textAppearanceSmall"
       android:id="@+id/dx1"
       android:layout_gravity="center_horizontal" />
   

Answer 1

除了视图参数名称中的代码约定错误之外，您的代码似乎是正确的。

确保在 onCreate 方法中扩展布局，并且您的 diagnose 方法将被调用。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_main_layout);
    // Where your_main_layout is the one who has the android:onClick="diagnose"
    // Rest of the code...
}

以防万一，假设android:onClick 是从 API 级别 4 开始引入的，因此请确保您的 API 目标满足这一要求。

编辑：

作为另一个测试，您可以将 View.OnClickListener 侦听器添加到您的活动中，并通过 View id 将此方法添加到您的 MainActivity.java 来获取所有 onClick 事件：

public class MainActivity extends Activity implements View.OnClickListener {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.your_main_layout);
      findViewById(R.id.SubmitButton).setOnClickListener(this);
  }
  ....
  @Override
  public void onClick(View v) {
        switch (v.getId()) {
            case R.id.SubmitButton:
                diagnose(v);
                break;
            default:
                break;
        }
    }

@Mike 也被@Coeus 检测到，将diagnose 方法移出onCreate 并使其成为MainActivity 类方法。否则当Android使用反射在Layout中查找diagnose方法时，它什么也找不到。