在設計應用的時候，我們應該熱愛極簡主義，簡單就是好的，對于很多用戶來說，復雜的東西并不受歡迎。
我要實現(xiàn)的是根據不同的情況去顯示不同的加載效果，隨用隨調，效果是借鑒于某一項目的效果，我認為有必要提取出來改善封裝一下，供以后使用。情況大致分為：加載中、無網絡、無數(shù)據、加載失敗等，這些僅僅就需要一個View 就可以搞定啦！
預覽下效果圖：
我們怎么實現(xiàn)這種效果呢
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>
從布局來看，我分了兩個部分，一個是加載中，另外一個是帶有ImagView、文字和按鈕的布局，有人看到這，就會說，哇靠，這不是很簡單嗎？根據不同的情況去設置Visibility的值就好了啊，沒錯，原理就是這樣。
XHLoadingView.java的代碼如下：
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; // 加載中的布局 private LinearLayout mLinearLoad; //其他加載的布局 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(); } } /** * 加載中提示文字 */ private String mLoadingText; private int mLoadingIcon; public XHLoadingView withLoadingIcon(int resId){ mLoadingIcon = resId; return this; } /** * 加載數(shù)據為空提示文字 */ private String mLoadEmptyText; private int mLoadEmptyIcon; public XHLoadingView withEmptyIcon(int resId){ mLoadEmptyIcon = resId; return this; } /** * 無網絡提示 */ private String mLoadNoNetworkText; private int mNoNetworkIcon; public XHLoadingView withNoNetIcon(int resId){ mNoNetworkIcon = resId; return this; } private OnRetryListener mOnRetryListener; /** * 定義重試的的接口 */ public interface OnRetryListener { void onRetry(); } public XHLoadingView withOnRetryListener(OnRetryListener mOnRetryListener){ this.mOnRetryListener = mOnRetryListener; return this; } /** * 設置加載的狀態(tài) * @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; } /** * 改變狀態(tài) * @param state */ private void changeState(LoadingState state) { switch (state) { //加載中 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; //數(shù)據為空 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; //加載失敗 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; //無網絡 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; } } /** * 后臺或者本地出現(xiàn)錯誤提示 */ private String mLoadErrorText; private int mErrorIco; public XHLoadingView withErrorIco(int resId) { mErrorIco = resId; return this; } /** * 加載空數(shù)據 * @param resId * @return */ public XHLoadingView withLoadEmptyText(int resId) { mLoadEmptyText = getResources().getString(resId); return this; } public XHLoadingView withLoadEmptyText(String mLoadEmptyText) { this.mLoadEmptyText = mLoadEmptyText; return this; } /** * 無網絡時候加載文字 * @param resId * @return */ public XHLoadingView withLoadNoNetworkText(int resId) { mLoadNoNetworkText = getResources().getString(resId); return this; } public String btn_empty_text = "重試"; public String btn_error_text = "重試"; public String btn_nonet_text = "重試"; /** * 數(shù)據為空的Button的文字提示 * @param text * @return */ public XHLoadingView withBtnEmptyText(String text) { this.btn_empty_text = text; return this; } /** * 加載錯誤的Button的文字提示 * @param text * @return */ public XHLoadingView withBtnErrorText(String text) { this.btn_error_text = text; return this; } /** * 加載錯誤的文字提示 * @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; } /** * 加載無網絡的Button的文字提示 * @param text * @return */ public XHLoadingView withBtnNoNetText(String text) { this.btn_nonet_text = text; return this; } /** * 加載沒有網路的文字提示 * @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; }}針對不同的情況作了不同的處理，然后我們在需要的Activity調用。
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("≥
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