手写一个通用加载中、显示数据、加载失败、空数据的LoadingView框架。
定义3个布局：加载中，加载失败，空数据
加载中:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
<?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> |
加载失败:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
<?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> |
空数据:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
<?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> |
自定义一个LoadingView:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
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; }} |
定义attrs.xml
|
1
2
3
4
5
6
7
8
9
|
<?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> |
以上就这么些代码，接下来我们测试一下
Activity
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
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; } }} |
源码：下载地址
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_14876133/article/details/80924356
