public class MainActivity extends AppCompatActivity {
private ListView listView;
private SimpleAdapter simpleAdapter;
private List<Map<String,Object>> personinfo;
Test test;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
test = new Test(this);
listView = (ListView) findViewById(R.id.list);
personinfo=new ArrayList<Map<String,Object>>();
simpleAdapter = new SimpleAdapter(this, getpersoninfo(), R.layout.item, new String[]{"pic", "text","age","sex"},
new int[]{R.id.pic, R.id.word,R.id.age,R.id.sex});
listView.setAdapter(simpleAdapter);
}
public Person[] getperson() {
Person[] persons=new Person[100];
int i=0;
SQLiteDatabase db=test.getReadableDatabase();
Cursor cursor=db.rawQuery("select * from info",null);
if(cursor!=null&&cursor.getCount()>0){
while (cursor.moveToNext()){
Person person=new Person();
person.setName(cursor.getString(1));
person.setSex(cursor.getString(2));
person.setAge(cursor.getString(3));
person.setImage(cursor.getString(4));
persons[i]=person;
i++;
}
}
cursor.close();
test.close();
return persons;
}
public List<Map<String,Object>> getpersoninfo(){
Person[] persons=getperson();
for(int i=0;i<persons.length;i++){
Map<String,Object> map=new HashMap<String, Object>();
map.put("pic",persons[i].image);
map.put("text",persons[i].name);
map.put("age",persons[i].age);
map.put("sex",persons[i].sex);
personinfo.add(map);
}
return personinfo;
}
}报错：FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fans.listview/com.example.fans.listview.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2204) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2254) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5069) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.example.fans.listview.MainActivity.getpersoninfo(MainActivity.java:60) at com.example.fans.listview.MainActivity.onCreate(MainActivity.java:29) at android.app.Activity.performCreate(Activity.java:5104) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1092) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2254) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5069) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method)
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