Autojs learning notes 6:text (txt) Findone() will report an error when switching apps. Finally, solve the implementation effect and switch any app until the script finds the control with the specified

Declare that I use autojs yes 4.1.1 edition

Catalog

Use text(txt).findOne() Result in an error

Core code

doubt

Solution and code

Conclusion

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Use text(txt).findOne() Result in an error

workbench.desktop.main.js:71 [Extension Host] 10:18:49.662/E: Wrapped java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.view.accessibility.AccessibilityNodeInfo.getPackageName()' on a null object reference ([remote]xfj.js#138)Wrapped java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.view.accessibility.AccessibilityNodeInfo.getPackageName()' on a null object reference    at receive ([remote]xfj.js:138:0)    at [remote]xfj.js:54:0    at file:///android_asset/modules/__bridges__.js:10:0

Core code

ui.callbackBtn.click(()=>{
    receive ()
});

function  receive (){
   var b = false;
    if( Click on the target control and time (" receive ",0)){
        b = true;
        toastLog(" Click... Successfully ")
    }else{
        log(" Click button not found ")
    }
    return b 
}

 /**
 * @param { Control content } txt 
 * @param { Time } kjTime 
 * @returns true  Find and process 
 */
  function  Click on the target control and time (txt,kjTime){
      var srk1;
      if(kjTime==0){
        srk1 = text(txt).findOne();
      }else{
        srk1 = text(txt).findOne(kjTime);
      }
      if(srk1!=null){
          srk1 = srk1.bounds();
          click(srk1.centerX(), srk1.centerY());
          return true;
      }else{
           return false;
       }
 }

doubt

Normal condition   This line in the code srk1 = text(txt).findOne();  Controls that do not find a description are blocked , But if you immediately switch to another app You're going to report a mistake .（ Switching to the system interface is normal ）.

Use findOnce() The function also reports an error .

Solution and code

utilize try catch Ideas to solve ！

function  receive (){
   var b = false;
       try{
           if( Click on the target control and time (" receive ",0)){
               b = true;
               toastLog(" Click... Successfully ")
           }else{
               log(" Click button not found ")
           }
       }catch(err){
           log(" Wrong report ！！！！")
            receive ();// If an error is reported, I will call again 
       }
   return b
}

Conclusion

Use text(txt).findOne() or text(txt).findOnce()  Just switch app Will immediately report an error （ When testing , I switch artificially app）.