Android通用LoadingView加载框架详解

<?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"
 android:background="#ffffff"
 android:clickable="true" 

 <ProgressBar
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:indeterminate="true" / 

</FrameLayout 

<?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"
 android:background="#ffffff"
 android:clickable="true"
 android:orientation="vertical" 

 <ImageView
  android:id="@+id/error_retry"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:gravity="center"
  android:src="@drawable/loading_retry" / 

</FrameLayout 

<?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"
 android:background="#ffffff"
 android:clickable="true"
 android:orientation="vertical" 

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:src="@drawable/loading_empty" / 

</FrameLayout 

package com.sample.loadingview.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.support.annotation.AttrRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import com.sample.loadingview.R;
public class LoadingView extends FrameLayout {
private int emptyLayoutId, errorLayoutId, loadingLayoutId;
private View contentView, emptyView, errorView, loadingView;
private LayoutInflater mInflater;
private SparseArray<View  views = new SparseArray< ();
public LoadingView(@NonNull Context context) {
this(context, null);
}
public LoadingView(@NonNull Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public LoadingView(@NonNull Context context, @Nullable AttributeSet attrs, @AttrRes int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LoadLayout);
emptyLayoutId = a.getResourceId(R.styleable.LoadLayout_emptyView, R.layout.loading_empty);
errorLayoutId = a.getResourceId(R.styleable.LoadLayout_errorView, R.layout.loading_error);
loadingLayoutId = a.getResourceId(R.styleable.LoadLayout_loadingView, R.layout.loading_load);
mInflater = LayoutInflater.from(getContext());
a.recycle();
loadingView = mInflater.inflate(loadingLayoutId, null);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
if (getChildCount() < 1) {
throw new RuntimeException("content view can not be null");
}
contentView = getChildAt(0);
if (loadingView.getVisibility() != GONE)
loadingView.setVisibility(GONE);
addView(loadingView);
views.put(loadingLayoutId, loadingView);
}
public void showError() {
errorView = views.get(errorLayoutId);
if (errorView == null) {
errorView = mInflater.inflate(errorLayoutId, null);
addView(errorView);
views.put(errorLayoutId, errorView);
final ImageView errorRetry = (ImageView) errorView.findViewById(R.id.error_retry);
errorRetry.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mOnRetryClickListener != null)
mOnRetryClickListener.onClick(errorRetry);
}
});
}
if (errorView.getVisibility() != VISIBLE)
errorView.setVisibility(VISIBLE);
for (int i = 0, len = views.size(); i < len; i++) {
int key = views.keyAt(i);
if (key != errorLayoutId) {
View view = views.valueAt(i);
if (view != null)
if (view.getVisibility() != GONE)
view.setVisibility(GONE);
}
}
}
public void showEmpty() {
emptyView = views.get(emptyLayoutId);
if (emptyView == null) {
emptyView = mInflater.inflate(emptyLayoutId, null);
addView(emptyView);
views.put(emptyLayoutId, emptyView);
}
if (emptyView.getVisibility() != VISIBLE)
emptyView.setVisibility(VISIBLE);
for (int i = 0, len = views.size(); i < len; i++) {
int key = views.keyAt(i);
if (key != emptyLayoutId) {
View view = views.valueAt(i);
if (view != null)
if (view.getVisibility() != GONE)
view.setVisibility(GONE);
}
}
}
public void showLoading() {
loadingView = views.get(loadingLayoutId);
if (loadingView.getVisibility() != VISIBLE)
loadingView.setVisibility(VISIBLE);
for (int i = 0, len = views.size(); i < len; i++) {
int key = views.keyAt(i);
if (key != loadingLayoutId) {
View view = views.valueAt(i);
if (view != null)
if (view.getVisibility() != GONE)
view.setVisibility(GONE);
}
}
}
public void showContent() {
for (int i = 0, len = views.size(); i < len; i++) {
View view = views.valueAt(i);
if (view != null)
if (view.getVisibility() != GONE)
view.setVisibility(GONE);
}
}
private OnClickListener mOnRetryClickListener;
public void setOnRetryClickListener(OnClickListener onRetryClickListener) {
this.mOnRetryClickListener = onRetryClickListener;
}
}

<?xml version="1.0" encoding="utf-8"? 
<resources 
<declare-styleable name="LoadLayout" 
<attr name="loadingView" format="reference" / 
<attr name="errorView" format="reference" / 
<attr name="retryView" format="reference" / 
<attr name="emptyView" format="reference" / 
</declare-styleable 
</resources 

package com.sample.loadingview;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.sample.loadingview.widget.LoadingView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private LoadingView loading_view;
private Button btn_loading;
private Button btn_content;
private Button btn_error;
private Button btn_empty;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loading_view = (LoadingView) findViewById(R.id.loading_view);
btn_loading = (Button) findViewById(R.id.btn_loading);
btn_content = (Button) findViewById(R.id.btn_content);
btn_error = (Button) findViewById(R.id.btn_error);
btn_empty = (Button) findViewById(R.id.btn_empty);
//设置加载错误的点击事件
loading_view.setOnRetryClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "重新加载", Toast.LENGTH_SHORT).show();
loading_view.showLoading();
}
});
btn_loading.setOnClickListener(this);
btn_content.setOnClickListener(this);
btn_error.setOnClickListener(this);
btn_empty.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_loading:
loading_view.showLoading();//显示加载界面
break;
case R.id.btn_content:
loading_view.showContent();//显示内容界面
break;
case R.id.btn_error:
loading_view.showError();//显示错误界面
break;
case R.id.btn_empty:
loading_view.showEmpty();//显示空数据界面
break;
}
}
}