一款超酷的Android自定义加载控件

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，这些仅仅就需要一个View 就可以搞定啦！

预览下效果图：

我们怎么实现这种效果呢
view_loading.xml的布局如下：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <LinearLayout
  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">
  <ImageView
   android:id="@+id/img_loading"
   android:layout_width="100dp"
   android:layout_height="100dp"
   android:src="@drawable/loading_animation" />
  <TextView
   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" />
 </LinearLayout>
 <LinearLayout
  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"
  >
  <ImageView
   android:id="@+id/iv_load"
   android:layout_width="100dp"
   android:layout_height="100dp"
   android:src="@mipmap/ic_launcher" />
  <TextView
   android:id="@+id/tv_load"
   android:layout_width="wrap_content"
   android:layout_gravity="center_horizontal"
   android:layout_height="wrap_content" />
  <Button
   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" />
 </LinearLayout>
</FrameLayout>

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;

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();
  }
 }
 
 private String mLoadingText;
 private int mLoadingIcon;
 public XHLoadingView withLoadingIcon(int resId){
  mLoadingIcon = resId;
  return this;
 }
 
 private String mLoadEmptyText;
 private int mLoadEmptyIcon;
 public XHLoadingView withEmptyIcon(int resId){
  mLoadEmptyIcon = resId;
  return this;
 }
 
 private String mLoadNoNetworkText;
 private int mNoNetworkIcon;
 public XHLoadingView withNoNetIcon(int resId){
  mNoNetworkIcon = resId;
  return this;
 }
 private OnRetryListener mOnRetryListener;
 
 public interface OnRetryListener {
  void onRetry();
 }
 public XHLoadingView withOnRetryListener(OnRetryListener mOnRetryListener){
  this.mOnRetryListener = mOnRetryListener;
  return this;
 }
 
 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;
 }
 
 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;
  }
 }
 
 private String mLoadErrorText;
 private int mErrorIco;
 public XHLoadingView withErrorIco(int resId) {
  mErrorIco = resId;
  return this;
 }
 
 public XHLoadingView withLoadEmptyText(int resId) {
  mLoadEmptyText = getResources().getString(resId);
  return this;
 }
 public XHLoadingView withLoadEmptyText(String mLoadEmptyText) {
  this.mLoadEmptyText = mLoadEmptyText;
  return this;
 }
 
 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";
 
 public XHLoadingView withBtnEmptyText(String text) {
  this.btn_empty_text = text;
  return this;
 }
 
 public XHLoadingView withBtnErrorText(String text) {
  this.btn_error_text = text;
  return this;
 }
 
 public XHLoadingView withLoadErrorText(int resId) {
  this.mLoadErrorText = getResources().getString(resId);
  return this;
 }
 public XHLoadingView withLoadErrorText(String mLoadedErrorText) {
  this.mLoadErrorText = mLoadedErrorText;
  return this;
 }
 
 public XHLoadingView withBtnNoNetText(String text) {
  this.btn_nonet_text = text;
  return this;
 }
 
 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);
.......
 }

上面我是为了展示不同的效果，所以写了几个点击事件呢，实际中不是这样的，初始化过后，在需要的地方调用OK， 源码中注释详细，就不用再做过多的解释了吧！

完整代码：XHLoadingView

作者：xuhao
QQ：504105930
转载请注明出处:http://blog.csdn.net/u011974987/article/details/51455333

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