Android studio想要从登陆界面跳转到这个界面会闪退，求解决，这个界面的代码有什么问题吗，但是并没有报错

Question

package com.example;

import android.app.TabActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
import com.example.AskHelp.SystemHelp;
import com.example.BloodPressure.BloodPressureActivity;
import com.example.BloodSugar.BloodSugarActivity;
import com.example.FileManager.FileManagerActivity;
import com.example.HeartAuscultation.HeartListen;
import com.geniuseoe.demo.R;

/**

• 功能描述：将系统的各个功能模块添加在TabHost选项卡中，实现在各选项卡之间手动切换以显示不同模块的内容

• */
  @SuppressWarnings("deprecation")
  public class MainTabHost extends TabActivity
  {
  private TabHost tabHost;
  private RadioGroup radioGroup;

  // Tab选项卡的图标数组
  private int[] tabIconViewArray =
  { R.drawable.tab_icon1, R.drawable.tab_icon2, R.drawable.tab_icon3,
  R.drawable.tab_icon4, R.drawable.tab_icon5 };

  // Tab选项卡的文字数组
  private String[] tabNameTextArray =
  { "档案", "血压", "血糖", "听诊", "帮助" };

  // Tab选项卡中的内容(类)数组
  private Class[] tabContentClassArray =
  { FileManagerActivity.class, BloodPressureActivity.class,
  BloodSugarActivity.class, HeartListen.class, SystemHelp.class };

  @Override
  public void onCreate(Bundle savedInstanceState)
  {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main_tab_host);

  // 为每一个选项卡设置按钮、图标、文字和内容，将Tab按钮添加进Tab选项卡中
  TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
  

  for (int i = 0; i < tabContentClassArray.length; i++) {
  TabSpec tabSpec = tabHost.newTabSpec(tabNameTextArray[i])
  .setIndicator(tabNameTextArray[i])
  .setContent(getTabItemIntent(i));
  tabHost.addTab(tabSpec);
  }
  initData();
  }

  // 对选项卡上的每个按钮进行监听，以实现模块的切换
  private void initData()
  {
  radioGroup = (RadioGroup) findViewById(R.id.main_radiogroup);
  radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
  {
  @Override
  public void onCheckedChanged(RadioGroup group, int checkedId)
  {
  switch (checkedId)
  {
  case R.id.RadioButton0:
  tabHost.setCurrentTabByTag(tabNameTextArray[0]);
  break;
  case R.id.RadioButton1:
  tabHost.setCurrentTabByTag(tabNameTextArray[1]);
  break;
  case R.id.RadioButton2:
  tabHost.setCurrentTabByTag(tabNameTextArray[2]);
  break;
  case R.id.RadioButton3:
  tabHost.setCurrentTabByTag(tabNameTextArray[3]);
  break;
  case R.id.RadioButton4:
  tabHost.setCurrentTabByTag(tabNameTextArray[4]);
  break;

          }
      }
  });
  ((RadioButton) radioGroup.getChildAt(0)).toggle();
  

  }

  // 给Tab选项卡设置Activity内容,并且将LoginActivity传入的swapUsername数据转让每个Intent携带分发给每个Tab选项
  private Intent getTabItemIntent(int index)
  {
  Bundle swapData = new Bundle();
  swapData.putString("swapUsername", this.getBundleData());
  Intent intent = new Intent(this, tabContentClassArray[index]);
  intent.putExtras(swapData);
  return intent;
  }

  // 获取启动该MainTabHostAcitivity的Intent,传入Intent携带的 username数据
  public String getBundleData()
  {
  Intent intent = getIntent();
  Bundle data = intent.getExtras();
  String swapData = data.getString("username").toString();
  return swapData;
  }
  }

Answer 1

Attempt to get length of array 。。。数组为空的原因吧。 检查一下tabContentClassArray 是否为空，打印一下。。