contentprovider怎么才能不重新查询一遍数据就能够刷新listview

MainActivity 的内容：
package comexampleandroidtest;
import androidappActivity;
import androidosBundle;
import androidviewGravity;
import androidviewView;
import androidviewViewOnClickListener;
import androidwidgetLinearLayout;
import androidwidgetListView;
import androidwidgetTextView;
public class MainActivity extends Activity implements OnClickListener {
ListView mListView;
TextViewAdapter mAdapter;
TextView notifyView;
TextView refreshItemView;
@Override
public void onClick(View v) {
switch (vgetId()) {
case 0x11: {
//使用一般方法刷新UI
String targetString = "2";
int targetIndex = -1;
// 1查找text内容为"2"的下标；
for (int j = 0; j < mListViewgetCount(); j++) {
String itemString = (String) mListViewgetItemAtPosition(j);
if (targetStringequals(itemString)) {
targetIndex = j;
break;
}
}
if (targetIndex >= 0) {
mAdaptersetGreenItem(targetIndex);
mAdapternotifyDataSetChanged();
}
}
break;
case 0x22: {
//使用高效的方法刷新UI（当然如果postion不在页面上，不需要刷新）
// 1我们想要修改text内容为"2"的Item的位置
String targetString = "2";
int targetIndex = -1;
for (int j = 0; j < mListViewgetCount(); j++) {
String itemString = (String) mListViewgetItemAtPosition(j);
if (targetStringequals(itemString)) {
targetIndex = j;
break;
}
}
if (targetIndex >= 0) {
mAdaptersetGreenItem(targetIndex);
int startShownIndex = mListViewgetFirstVisiblePosition();
int endShownIndex = mListViewgetLastVisiblePosition();
if (targetIndex >= startShownIndex
&& targetIndex <= endShownIndex) {
View view = mListViewgetChildAt(targetIndex
- startShownIndex);
mListViewgetAdapter()
getView(targetIndex, view, mListView);
}
}
}
break;
default:
break;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
superonCreate(savedInstanceState);
LinearLayout outLayout = new LinearLayout(this);
outLayoutsetOrientation(LinearLayoutVERTICAL);
notifyView = new TextView(this);
notifyViewsetId(0x11);
notifyViewsetLayoutParams(new LinearLayoutLayoutParams(
LinearLayoutLayoutParamsMATCH_PARENT, 100));
notifyViewsetText("调用notifyDataSetChange刷新数据");
notifyViewsetGravity(GravityCENTER);
refreshItemView = new TextView(this);
refreshItemViewsetId(0x22);
refreshItemViewsetLayoutParams(new LinearLayoutLayoutParams(
LinearLayoutLayoutParamsMATCH_PARENT, 100));
refreshItemViewsetText("调用refresh Item刷新数据");
refreshItemViewsetGravity(GravityCENTER);
mListView = new ListView(this);
outLayoutaddView(notifyView);
outLayoutaddView(refreshItemView);
outLayoutaddView(mListView);
setContentView(outLayout);
mAdapter = new TextViewAdapter(this);
mListViewsetAdapter(mAdapter);
notifyViewsetOnClickListener(this);
refreshItemViewsetOnClickListener(this);
}
}

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