概述：
在设计应用的时候，我们应该热爱极简主义，简单就是好的，对于很多用户来说，复杂的东西并不受欢迎。
我要实现的是根据不同的情况去显示不同的加载效果，随用随调，效果是借鉴于某一项目的效果，我认为有必要提取出来改善封装一下，供以后使用。情况大致分为：加载中、无网络、无数据、加载失败等；
预览下效果图
这里写图片描述
我们怎么实现这种效果呢
view_loading.xml的布局如下：
android:layout_width="match_parent"
android:layout_height="match_parent">
android:id="@+id/lin_loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone"
android:orientation="vertical">
android:id="@+id/img_loading"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@drawable/loading_animation" />
android:id="@+id/tv_loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_gravity="center_horizontal"
android:textSize="14sp" />
android:id="@+id/lin_load"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical"
android:visibility="visible"
>
android:id="@+id/iv_load"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@mipmap/ic_launcher" />
android:id="@+id/tv_load"
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_height="wrap_content" />
android:id="@+id/btn_load"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_gravity="center_horizontal"
android:textSize="14sp" />
从布局来看，我分了两个部分，一个是加载中，另外一个是带有ImagView、文字和按钮的布局，有人看到这，就会说，哇靠，这不是很简单吗？根据不同的情况去设置Visibility的值就好了啊，没错，原理就是这样。
XHLoadingView.java的代码如下：
package com.woyou.loadingdemo.widget;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.woyou.loadingdemo.LoadingState;
import com.woyou.loadingdemo.R;
/**
* Created by Xiho on 11:21.
*/
public class XHLoadingView extends FrameLayout {
private Context mContext;
// 加载中的布局
private LinearLayout mLinearLoad;
//其他加载的布局
private LinearLayout mLinearLoading;
private TextView mTvLoading;
private TextView mTvLoad;
private ImageView mIvLoading;
private ImageView mIvLoad;
private Button mBtnLoad;
private LoadingState mState;
private AnimationDrawable animation;
public XHLoadingView(Context context) {
super(context);
mContext = context;
}
public XHLoadingView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
}
public XHLoadingView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mContext = context;
}
public XHLoadingView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mContext = context;
}
public void build(){
LayoutInflater.from(mContext).inflate(R.layout.view_loading, this, true);
mLinearLoading = (LinearLayout) findViewById(R.id.lin_loading);
mLinearLoad = (LinearLayout) findViewById(R.id.lin_load);
mIvLoading = (ImageView) findViewById(R.id.img_loading);
mIvLoad = (ImageView) findViewById(R.id.iv_load);
mTvLoading = (TextView) findViewById(R.id.tv_loading);
mTvLoad = (TextView) findViewById(R.id.tv_load);
mBtnLoad = (Button) findViewById(R.id.btn_load);
mBtnLoad.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setState(LoadingState.STATE_LOADING);
mOnRetryListener.onRetry();
}
});
}
@Override
public void setVisibility(int visibility) {
super.setVisibility(visibility);
if(View.GONE==visibility && mState==LoadingState.STATE_LOADING && animation!=null&&animation.isRunning()){
animation.stop();
}
}
/**
* 加载中提示文字
*/
private String mLoadingText;
private int mLoadingIcon;
public XHLoadingView withLoadingIcon(int resId){
mLoadingIcon = resId;
return this;
}
/**
* 加载数据为空提示文字
*/
private String mLoadEmptyText;
private int mLoadEmptyIcon;
public XHLoadingView withEmptyIcon(int resId){
mLoadEmptyIcon = resId;
return this;
}
/**
* 无网络提示
*/
private String mLoadNoNetworkText;
private int mNoNetworkIcon;
public XHLoadingView withNoNetIcon(int resId){
mNoNetworkIcon = resId;
return this;
}
private OnRetryListener mOnRetryListener;
/**
* 定义重试的的接口
*/
public interface OnRetryListener {
void onRetry();
}
public XHLoadingView withOnRetryListener(OnRetryListener mOnRetryListener){
this.mOnRetryListener = mOnRetryListener;
return this;
}
/**
* 设置加载的状态
* @param state
*/
public void setState(LoadingState state){
if(mState==state){
return;
}else if(state==LoadingState.STATE_LOADING){
mLinearLoading.setVisibility(VISIBLE);
mLinearLoad.setVisibility(GONE);
}else if(state!=LoadingState.STATE_LOADING){
mLinearLoading.setVisibility(GONE);
mLinearLoad.setVisibility(VISIBLE);
if(animation!=null && mState==LoadingState.STATE_LOADING)
animation.stop();
}
changeState(state);
}
public boolean btnEmptyEnable = true;
public boolean btnErrorEnable = true;
public boolean btnNoNetworkEnable = true;
public XHLoadingView withBtnNoNetEnnable(boolean ennable) {
btnNoNetworkEnable = ennable;
return this;
}
public XHLoadingView withBtnErrorEnnable(boolean ennable) {
btnErrorEnable = ennable;
return this;
}
public XHLoadingView withBtnEmptyEnnable(boolean ennable) {
btnEmptyEnable = ennable;
return this;
}
/**
* 改变状态
* @param state
*/
private void changeState(LoadingState state) {
switch (state) {
//加载中
case STATE_LOADING:
mState = LoadingState.STATE_LOADING;
mIvLoading.setImageResource(mLoadingIcon);
mTvLoading.setText(mLoadingText);
if (animation == null) {
animation = (AnimationDrawable) mIvLoading.getDrawable();
}
if (animation != null)
animation.start();
break;
//数据为空
case STATE_EMPTY:
mState = LoadingState.STATE_EMPTY;
mIvLoad.setImageResource(mLoadEmptyIcon);
mTvLoad.setText(mLoadEmptyText);
if (btnEmptyEnable) {
mBtnLoad.setVisibility(VISIBLE);
mBtnLoad.setText(btn_empty_text);
} else {
mBtnLoad.setVisibility(GONE);
}
break;
//加载失败
case STATE_ERROR:
mState = LoadingState.STATE_ERROR;
mIvLoad.setImageResource(mErrorIco);
mTvLoad.setText(mLoadErrorText);
if (btnErrorEnable) {
mBtnLoad.setVisibility(VISIBLE);
mBtnLoad.setText(btn_error_text);
} else {
mBtnLoad.setVisibility(GONE);
}
break;
//无网络
case STATE_NO_NET:
mState = LoadingState.STATE_NO_NET;
mIvLoad.setImageResource(mNoNetworkIcon);
mTvLoad.setText(mLoadNoNetworkText);
if (btnNoNetworkEnable) {
mBtnLoad.setVisibility(VISIBLE);
mBtnLoad.setText(btn_nonet_text);
} else {
mBtnLoad.setVisibility(GONE);
}
break;
}
}
/**
* 后台或者本地出现错误提示
*/
private String mLoadErrorText;
private int mErrorIco;
public XHLoadingView withErrorIco(int resId) {
mErrorIco = resId;
return this;
}
/**
* 加载空数据
* @param resId
* @return
*/
public XHLoadingView withLoadEmptyText(int resId) {
mLoadEmptyText = getResources().getString(resId);
return this;
}
public XHLoadingView withLoadEmptyText(String mLoadEmptyText) {
this.mLoadEmptyText = mLoadEmptyText;
return this;
}
/**
* 无网络时候加载文字
* @param resId
* @return
*/
public XHLoadingView withLoadNoNetworkText(int resId) {
mLoadNoNetworkText = getResources().getString(resId);
return this;
}
public String btn_empty_text = "重试";
public String btn_error_text = "重试";
public String btn_nonet_text = "重试";
/**
* 数据为空的Button的文字提示
* @param text
* @return
*/
public XHLoadingView withBtnEmptyText(String text) {
this.btn_empty_text = text;
return this;
}
/**
* 加载错误的Button的文字提示
* @param text
* @return
*/
public XHLoadingView withBtnErrorText(String text) {
this.btn_error_text = text;
return this;
}
/**
* 加载错误的文字提示
* @param resId
* @return
*/
public XHLoadingView withLoadErrorText(int resId) {
this.mLoadErrorText = getResources().getString(resId);
return this;
}
public XHLoadingView withLoadErrorText(String mLoadedErrorText) {
this.mLoadErrorText = mLoadedErrorText;
return this;
}
/**
* 加载无网络的Button的文字提示
* @param text
* @return
*/
public XHLoadingView withBtnNoNetText(String text) {
this.btn_nonet_text = text;
return this;
}
/**
* 加载没有网路的文字提示
* @param mLoadedNoNetText
* @return
*/
public XHLoadingView withLoadNoNetworkText(String mLoadedNoNetText) {
this.mLoadNoNetworkText = mLoadedNoNetText;
return this;
}
public XHLoadingView withLoadingText(int resId) {
this.mLoadingText = getResources().getString(resId);
return this;
}
public XHLoadingView withLoadingText(String mLoadingText) {
this.mLoadingText = mLoadingText;
return this;
}
}
针对不同的情况作了不同的处理，然后我们在需要的Activity调用。
private XHLoadingView mLoadingView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display);
mLoadingView = (XHLoadingView) findViewById(R.id.lv_loading);
mLoadingView.withLoadEmptyText("≥﹏≤ , 啥也木有 !").withEmptyIcon(R.drawable.disk_file_no_data).withBtnEmptyEnnable(false)
.withErrorIco(R.drawable.ic_chat_empty).withLoadErrorText("(῀( ˙᷄ỏ˙᷅ )῀)ᵒᵐᵍᵎᵎᵎ,我家程序猿跑路了 !").withBtnErrorText("臭狗屎!!!")
.withLoadNoNetworkText("你挡着信号啦o(￣ヘ￣o)☞ᗒᗒ 你走").withNoNetIcon(R.drawable.ic_chat_empty).withBtnNoNetText("网弄好了，重试")
.withLoadingIcon(R.drawable.loading_animation).withLoadingText("加载中...").withOnRetryListener(new XHLoadingView.OnRetryListener() {
@Override
public void onRetry() {
SnackbarUtil.show(mLoadingView,"已经在努力重试了",0);
}
}).build();
}
........
//加载中
mLoadingView.setVisibility(View.VISIBLE);
mLoadingView.setState(LoadingState.STATE_LOADING);
//空数据
mLoadingView.setVisibility(View.VISIBLE);
mLoadingView.setState(LoadingState.STATE_EMPTY)
//无网络
mLoadingView.setVisibility(View.VISIBLE);
mLoadingView.setState(LoadingState.STATE_NO_NET);
//加载错误
mLoadingView.setVisibility(View.VISIBLE);
mLoadingView.setState(LoadingState.STATE_ERROR);
.......
}
源码中注释详细，就不用再做过多的解释了吧！
