手寫一個通用加載中、顯示數據、加載失敗、空數據的LoadingView框架。
定義3個布局：加載中，加載失敗，空數據
加載中:
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<?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> |
加載失敗:
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<?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> |
空數據:
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<?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> |
自定義一個LoadingView:
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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; }} |
定義attrs.xml
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<?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> |
以上就這么些代碼，接下來我們測試一下
Activity
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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); //設置加載錯誤的點擊事件 loading_view.setOnRetryClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "重新加載", 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();//顯示加載界面 break; case R.id.btn_content: loading_view.showContent();//顯示內容界面 break; case R.id.btn_error: loading_view.showError();//顯示錯誤界面 break; case R.id.btn_empty: loading_view.showEmpty();//顯示空數據界面 break; } }} |
源碼：下載地址
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原文鏈接：https://blog.csdn.net/qq_14876133/article/details/80924356
