報錯信息如下：

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

意思是無法在尚未調用的線程內創建處理程序
簡單的說要在子線程里調用UI

錯誤代碼展示：

AlertDialog.Builder builder = new AlertDialog.Builder(MyEnrollAssociationInfoActivity.this);builder.setTitle("撤銷");builder.setMessage("您確定要撤銷此社團嗎？");//確定builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {HttpUtils.getInstance().postMethod(BaseConfig.APP_ID+"/AssociationEnrollApp/deleteAssociation/"+associationEnrollId+"/"+ associationId, new HttpUtils.HttpListener() {@Overridepublic void requestFinish(String response) {Result<User> result = new Result<>();Type type = new TypeToken<Result<User>>() {}.getType();//解決Gson解析時出現的bugresult = new Gson().fromJson(response, type);Log.i("請求數據：",result.toString());if(result.getStatus().equals("200")) {JUtils.ToastInLoop("撤銷成功!");}else {JUtils.ToastInLoop("撤銷失敗!");}}@Overridepublic void requestError(Exception e) {}});}});//取消builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MyEnrollAssociationInfoActivity.this,"已取消",Toast.LENGTH_LONG).show();}});builder.create();builder.show();

解決辦法：
在對話框的外層加上MyEnrollAssociationInfoActivity.this.runOnUiThread

MyEnrollAssociationInfoActivity.this.runOnUiThread(new Runnable() {@Overridepublic void run() {AlertDialog.Builder builder = new AlertDialog.Builder(MyEnrollAssociationInfoActivity.this);builder.setTitle("撤銷");builder.setMessage("您確定要撤銷此社團嗎？");//確定builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {HttpUtils.getInstance().postMethod(BaseConfig.APP_ID+"/AssociationEnrollApp/deleteAssociation/"+associationEnrollId+"/"+ associationId, new HttpUtils.HttpListener() {@Overridepublic void requestFinish(String response) {Result<User> result = new Result<>();Type type = new TypeToken<Result<User>>() {}.getType();//解決Gson解析時出現的bugresult = new Gson().fromJson(response, type);Log.i("請求數據：",result.toString());if(result.getStatus().equals("200")) {JUtils.ToastInLoop("撤銷成功!");}else {JUtils.ToastInLoop("撤銷失敗!");}}@Overridepublic void requestError(Exception e) {}});}});//取消builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MyEnrollAssociationInfoActivity.this,"已取消",Toast.LENGTH_LONG).show();}});builder.create();builder.show();}});

總結

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