在网上找了很久，都没有找到自己想要的结果，所以自己就写了一个，并把它放到了github上，喜欢的朋友可以去下载源码看下。先上代码
public abstract class LoadPager extends FrameLayout {
public static final int STATE_UNKOWN = 0;
public static final int STATE_LOADING = 1;
public static final int STATE_ERROR = 2;
public static final int STATE_EMPTY = 3;
public static final int STATE_SUCCESS = 4;
public int state = STATE_UNKOWN;
private View loadingView;// 加载中的界面
private View errorView;// 错误界面
private View emptyView;// 空界面
private View successView;// 加载成功的界面
private Context mContext;
public LoadPager(Context context) {
super(context);
mContext = context;
init();
}
public LoadPager(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}
public LoadPager(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
private void init() {
loadingView = createLoadingView(); // 创建了加载中的界面
if (loadingView != null) {
this.addView(loadingView, new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
errorView = createErrorView(); // 加载错误界面
if (errorView != null) {
this.addView(errorView, new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
emptyView = createEmptyView(); // 加载空的界面
if (emptyView != null) {
this.addView(emptyView, new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
showPage(STATE_LOADING);// 根据不同的状态显示不同的界面
}
// 根据不同的状态显示不同的界面
public void showPage(int result) {
state = result;
if (loadingView != null) {
loadingView.setVisibility(state == STATE_UNKOWN
|| state == STATE_LOADING ? View.VISIBLE : View.INVISIBLE);
}
if (errorView != null) {
errorView.setVisibility(state == STATE_ERROR ? View.VISIBLE
: View.INVISIBLE);
}
if (emptyView != null) {
emptyView.setVisibility(state == STATE_EMPTY ? View.VISIBLE
: View.INVISIBLE);
}
if (state == STATE_SUCCESS) {
if (successView == null) {
successView = createSuccessView();
this.addView(successView, new FrameLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
successView.setVisibility(View.VISIBLE);
} else {
if (successView != null) {
successView.setVisibility(View.INVISIBLE);
}
}
}
/* 创建了空的界面 */
private View createEmptyView() {
return View.inflate(mContext, R.layout.loadpage_empty,
null);
}
/* 创建了错误界面 */
private View createErrorView() {
View view = View.inflate(mContext, R.layout.loadpage_error,
null);
Button page_bt = (Button) view.findViewById(R.id.page_bt);
page_bt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
show();
}
});
return view;
}
/* 创建加载中的界面 */
private View createLoadingView() {
return View.inflate(mContext,
R.layout.loadpage_loading, null);
}
// 根据服务器的数据 切换状态
public void show() {
if (state == STATE_ERROR || state == STATE_EMPTY) {
state = STATE_LOADING;
}
load();
showPage(state);
}
/***
* 创建成功的界面
*/
public abstract View createSuccessView();
/**
* 请求服务器
* 必须在请求完成后调用showPage方法
*/
protected abstract void load();
}
上面的注释都写的很清楚啦，如果对此类还不了解的朋友请在下面留言，看到后我将会回复你的。
下面显示如何在基类中使用LoadPager，使得以后我们少写很多的代码。
<pre name="code" class="java">public abstract class BaseFragment extends Fragment{
protected LoadPager mLoadPager = null;
protected Context mContext = getActivity() == null ? APP.getInstance() : getActivity();
protected ViewGroup mContainer;
protected LayoutInflater mInflater;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
mContainer = container;
mInflater = inflater;
if (mLoadPager == null){
mLoadPager = new LoadPager(mContext) {
@Override
public View createSuccessView() {
return BaseFragment.this.createSuccessView();
}
@Override
protected void load() {
BaseFragment.this.loadData();
}
};
}
return mLoadPager;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
show();
}
public void show(){
if(mLoadPager!=null){
mLoadPager.show();
}
}
/**
* 必须在获取到数据后调用checkData方法
* */
protected abstract void loadData();
protected abstract View createSuccessView();
/**校验数据 */
protected void checkData(Object datas) {
if(datas==null){
mLoadPager.showPage(LoadPager.STATE_ERROR);// 请求服务器失败
}else{
try {
@SuppressWarnings("unchecked") List<Object> ds = (List<Object>) datas;
if(ds.size()==0){
mLoadPager.showPage(LoadPager.STATE_EMPTY);
}else{
mLoadPager.showPage(LoadPager.STATE_SUCCESS);
}
} catch (Exception e) {
e.printStackTrace();
if("".equals(datas)){
mLoadPager.showPage(LoadPager.STATE_EMPTY);
}else{
mLoadPager.showPage(LoadPager.STATE_SUCCESS);
}
}
}
}
}
下面来看看我们在子类中如何使用
</pre><pre code_snippet_id="1677905" snippet_file_name="blog_20160510_8_2136022" name="code" class="java"><pre name="code" class="java">public class ErrorFragment extends BaseFragment {
private String str = "加载成功啦";
@Override
protected void loadData() {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(3000);
APP.getMainThreadHandler().post(new Runnable() {
@Override
public void run() {
checkData(null);
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
@Override
protected View createSuccessView() {
TextView tv = new TextView(mContext);
tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
tv.setText(str);
return tv;
}
}
这里使用线程是为了模拟在网络中请求数据的耗时操作。
好了，基本就是这样了，如果您代码不够好，有什么好的想法可以给我留言或者加我QQ347402035，请填写理由，否则可能会添加失败。
时间： 2024-10-02 21:38:40