Android自定义view实现加载中、加载失败、无数据
一、概述
Android中经常在有的app中可以见到“加载中”并不是以弹出对话框的形式显示的，而是占用整个屏幕，如果加载失败就会出现加载失败页面，点击加载失败页面中任意区域，都可以重新加载。今天就和大家一起学习如何通过自定义view的方式实现加载中、加载失败、无数据的效果。
二、实现代码
自定义属性文件
<declare-styleable name="LoadingLayout">
<attr name="loadingView" format="reference" />
<attr name="stateView" format="reference" />
<attr name="emptyView" format="reference" />
declare-styleable>自定义view：LoadingLayout.java
package com.czhappy.effectdemo.loadinglayout;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import com.czhappy.effectdemo.R;
public class LoadingLayout extends FrameLayout {
/**
* 空数据View
*/
private int mEmptyView;
/**
* 状态View
*/
private int mStateView;
/**
* 加载View
*/
private int mLoadingView;
public LoadingLayout(Context context) {
this(context, null);
}
public LoadingLayout(Context context, AttributeSet attrs) {
this(context, attrs, -1);
}
public LoadingLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.LoadingLayout, 0, 0);
try {
mStateView = a.getResourceId(R.styleable.LoadingLayout_stateView, R.layout.loadstate_layout);
mLoadingView = a.getResourceId(R.styleable.LoadingLayout_loadingView, R.layout.loading_layout);
mEmptyView = a.getResourceId(R.styleable.LoadingLayout_emptyView, R.layout.empty_layout);
LayoutInflater inflater = LayoutInflater.from(getContext());
inflater.inflate(mStateView, this, true);
inflater.inflate(mLoadingView, this, true);
inflater.inflate(mEmptyView, this, true);
} finally {
a.recycle();
}
}
/**
* 布局加载完成后隐藏所有View
*/
@Override
protected void onFinishInflate() {
super.onFinishInflate();
for (int i = 0; i < getChildCount() - 1; i++) {
getChildAt(i).setVisibility(GONE);
}
}
/**
* 设置Empty点击事件
* @param listener
*/
public void setEmptyClickListener(final OnClickListener listener) {
if( listener!=null )
findViewById(R.id.state_retry2).setOnClickListener(listener);
}
/**
* 设置State点击事件
* @param listener
*/
public void setStateClickListener( OnClickListener listener ){
if(listener!=null)
findViewById(R.id.state_retry).setOnClickListener(listener);
}
/**
* 设置自定义布局的点击事件
* @param resoureId
* @param listener
*/
public void setViewOncClickListener(int resoureId,OnClickListener listener) {
findViewById(resoureId).setOnClickListener(listener);
}
/**
* 设置自定义布局的view文本
* @param resoureId
* @param text
*/
public void setViewText(int resoureId,String text){
((TextView)findViewById(resoureId)).setText(text);
}
/**
* 设置自定义布局的image
* @param resoureId
* @param img
*/
public void setViewImage(int resoureId,int img ){
((ImageView)findViewById(resoureId)).setImageResource(img);
}
/**
* State View
*/
public void showState() {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 0) {
child.setVisibility(VISIBLE);
} else {
child.setVisibility(GONE);
}
}
}
/**
* Empty view
*/
public void showEmpty() {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 2) {
child.setVisibility(VISIBLE);
} else {
child.setVisibility(GONE);
}
}
}
/**
* Loading view
*/
public void showLoading() {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 1) {
child.setVisibility(VISIBLE);
} else {
child.setVisibility(GONE);
}
}
}
/**
*
* @param text
*/
public void showLoading(String text) {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 1) {
child.setVisibility(VISIBLE);
((TextView) child.findViewById(R.id.loading_text)).setText(text + "");
} else {
child.setVisibility(GONE);
}
}
}
/**
* Empty view
*
* @param text
*/
public void showEmpty(String text) {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 2) {
child.setVisibility(VISIBLE);
((TextView) child.findViewById(R.id.empty_text)).setText(text + "");
} else {
child.setVisibility(GONE);
}
}
}
/**
*
* @param tips
*/
public void showState(String tips) {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 0) {
child.setVisibility(VISIBLE);
((TextView) child.findViewById(R.id.load_state_tv)).setText(tips + "");
} else {
child.setVisibility(GONE);
}
}
}
/**
* @param stateId
* @param tips
*/
public void showState(int stateId, String tips) {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i == 0) {
child.setVisibility(VISIBLE);
((ImageView) child.findViewById(R.id.load_state_img)).setImageResource(stateId);
((TextView) child.findViewById(R.id.load_state_tv)).setText(tips + "");
} else {
child.setVisibility(GONE);
}
}
}
/**
* 展示内容
*/
public void showContent() {
for (int i = 0; i < this.getChildCount(); i++) {
View child = this.getChildAt(i);
if (i > 2 ) {
child.setVisibility(VISIBLE);
} else {
child.setVisibility(GONE);
}
}
}
}测试类LoadingLayoutActivity.java
package com.czhappy.effectdemo.activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import com.czhappy.effectdemo.R;
import com.czhappy.effectdemo.loadinglayout.LoadingLayout;
/**
* Description:
* User: chenzheng
* Date: 2017/2/17 0017
* Time: 18:05
*/
public class LoadingLayoutActivity extends AppCompatActivity implements View.OnClickListener{
private Button btn1, btn2, btn3;
private LoadingLayout mLoading;
private Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what==1000){
mLoading.showContent();
}else if(msg.what==2000){
mLoading.showState("加载失败，点击重试！");
}else if(msg.what==3000){
mLoading.showEmpty();
}
}
};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loading_layout);
initView();
}
private void initView() {
mLoading = (LoadingLayout) findViewById(R.id.loading_layout);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
mLoading.showContent();
mLoading.setStateClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模拟网络请求
mHandler.sendEmptyMessage(2000);
}
},1000);
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn1:
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模拟网络请求
mHandler.sendEmptyMessage(1000);
}
},2000);
break;
case R.id.btn2:
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模拟网络请求
mHandler.sendEmptyMessage(2000);
}
},2000);
break;
case R.id.btn3:
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模拟网络请求
mHandler.sendEmptyMessage(3000);
}
},2000);
break;
}
}
}
正在加载的布局文件loading_layout.xml
至于empty_layout.xml和loadstate_layout.xml这些简单布局的代码就不贴出来了，根据需要自己定义。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:id="@+id/loading_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<com.pnikosis.materialishprogress.ProgressWheel
android:id="@+id/progress_wheel"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
wheel:matProg_barColor="#5588FF"
wheel:matProg_progressIndeterminate="true" />
<TextView
android:id="@+id/loading_text"
android:layout_width="wrap_content"
android:padding="5dp"
android:layout_height="wrap_content"
android:text=" 正在加载..."
android:textColor="#999999"
android:textSize="15sp" />
LinearLayout>三、注意事项
项目中实现正在加载的material design风格的进度动画，用的是开源库
https://github.com/pnikosis/materialish-progress
如果你有其他需求，可以自己替换
