前言
在android开发中，对于网络加载、本地数据加载等耗时任务时，为了更好的用户体验，会先给用户展示一些等待图或者动画一类的占位图。对于列表更是需要处理空数据等其他异常情况。本篇的主角 EmptyLayout 就是由此而生。 借鉴：oschina
先上效果
直接上代码
代码位置
EmptyLayout.java
该控件主要是setErrorType方法，控制显示类型。1
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190public class EmptyLayout extends LinearLayout implements
View.OnClickListener {
public static final int NETWORK_ERROR = 1; // 网络异常
public static final int NETWORK_LOADING = 2;//加载中
public static final int NODATA = 3;//暂无数据
public static final int HIDE_LAYOUT = 4;//隐藏该控件
public static final int NO_LOGIN = 5;//未登录
private Loading mLoading;
private boolean clickEnable = true;
private final Context context;
public ImageView img;
private int mErrorState;
private String strNoDataContent = "";
private TextView tv;
private boolean mLoadingLocalFriend;
private OnViewClick listener;
public EmptyLayout(Context context) {
super(context);
this.context = context;
init();
}
public EmptyLayout(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
init();
}
private void init() {
View view = LayoutInflater.from(getContext()).inflate(R.layout.widget_empty_layout, this, false);
img = (ImageView) view.findViewById(R.id.img_error_layout);
tv = (TextView) view.findViewById(R.id.tv_error_layout);
mLoading = (Loading) view.findViewById(R.id.animProgress);
setBackgroundColor(-1);
setOnClickListener(this);
img.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (clickEnable && mErrorState != NETWORK_LOADING) {
if (listener != null)
listener.onViewClick(v);
}
}
});
addView(view);
}
public void dismiss() {
mErrorState = HIDE_LAYOUT;
setVisibility(View.GONE);
}
public int getErrorState() {
return mErrorState;
}
public boolean isLoadError() {
return mErrorState == NETWORK_ERROR;
}
public boolean isLoading() {
return mErrorState == NETWORK_LOADING;
}
public void onClick(View v) {
if (clickEnable && mErrorState != NETWORK_LOADING) {
if (listener != null)
listener.onViewClick(v);
}
}
/**
* 修改提示文本
*
* @param msg
*/
public void setErrorMessage(String msg) {
tv.setText(msg);
}
/**
* 修改提示文本
*
* @param loadingLocalFriend
*/
public void setLoadingLocalFriend(boolean loadingLocalFriend) {
this.mLoadingLocalFriend = loadingLocalFriend;
tv.setText(R.string.error_view_loading_local_friend);
}
/**
* 修改显示图片
*
* @param imgResource
*/
public void setErrorImg(int imgResource) {
try {
img.setImageResource(imgResource);
} catch (Exception e) {
}
}
/**
* 修改显示类型
*
* @param i
*/
public void setErrorType(int i) {
if (HIDE_LAYOUT == i && HIDE_LAYOUT == mErrorState) {
return;
}
setVisibility(View.VISIBLE);
switch (i) {
case NETWORK_ERROR:
mErrorState = NETWORK_ERROR;
if (TDevice.hasInternet(context)) {
tv.setText(R.string.error_view_load_error_click_to_refresh);
img.setBackgroundResource(R.drawable.page_tip_fail);
} else {
tv.setText(R.string.tip_network_error);
img.setBackgroundResource(R.drawable.page_tip_network);
}
img.setVisibility(View.VISIBLE);
mLoading.stop();
mLoading.setVisibility(View.GONE);
clickEnable = true;
break;
case NETWORK_LOADING:
mErrorState = NETWORK_LOADING;
mLoading.setVisibility(View.VISIBLE);
mLoading.start();
img.setVisibility(View.GONE);
if (mLoadingLocalFriend) {
tv.setText(R.string.error_view_loading_local_friend);
} else {
tv.setText(R.string.error_view_loading);
}
clickEnable = false;
break;
case NODATA:
mErrorState = NODATA;
img.setBackgroundResource(R.drawable.page_icon_empty);
img.setVisibility(View.VISIBLE);
mLoading.stop();
mLoading.setVisibility(View.GONE);
setTvNoDataContent();
clickEnable = true;
break;
case HIDE_LAYOUT:
mLoading.stop();
setVisibility(View.GONE);
break;
default:
break;
}
}
public void setNoDataContent(String noDataContent) {
strNoDataContent = noDataContent;
}
public void setOnLayoutClickListener(OnViewClick listener) {
this.listener = listener;
}
public void setTvNoDataContent() {
if (!strNoDataContent.equals(""))
tv.setText(strNoDataContent);
else
tv.setText(R.string.error_view_no_data);
}
public void setVisibility(int visibility) {
if (visibility == View.GONE)
mErrorState = HIDE_LAYOUT;
super.setVisibility(visibility);
}
public static interface OnViewClick {
void onViewClick(View v);
}
}
layout widget_empty_layout.xml
其中Loading为加载动画，也可用ProgressBar替换
1 | <?xml version="1.0" encoding="utf-8"?> |
values
1 | <string name="error_view_no_data">暂无内容</string> |
