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;/** * 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);....... }
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
以上就是本文的全部内容，希望对大家学习Android软件编程有所帮助。
旅行还在继续，这个过程是艰难而又孤单的。
