Android自定義view實現載入中、載入失敗、無資料
阿新 • • 發佈：2018-12-23
一、概述
Android中經常在有的app中可以見到“載入中”並不是以彈出對話方塊的形式顯示的，而是佔用整個螢幕，如果載入失敗就會出現載入失敗頁面，點選載入失敗頁面中任意區域，都可以重新載入。今天就和大家一起學習如何通過自定義view的方式實現載入中、載入失敗、無資料的效果。
二、實現程式碼
自定義屬性檔案
<declare-styleable name="LoadingLayout">
<attr name="loadingView" format="reference" />
<attr name="stateView" 自定義view：LoadingLayout.java
package com.czhappy.effectdemo.loadinglayout;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import 測試類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("載入失敗，點選重試！");
}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();
//模擬網路請求
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();
//模擬網路請求
mHandler.sendEmptyMessage(1000);
}
},2000);
break;
case R.id.btn2:
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模擬網路請求
mHandler.sendEmptyMessage(2000);
}
},2000);
break;
case R.id.btn3:
mLoading.showLoading();
mLoading.postDelayed(new Thread(){
@Override
public void run() {
super.run();
//模擬網路請求
mHandler.sendEmptyMessage(3000);
}
},2000);
break;
}
}
}
正在載入的佈局檔案loading_layout.xml
至於empty_layout.xml和loadstate_layout.xml這些簡單佈局的程式碼就不貼出來了，根據需要自己定義。
<?xml version="1.0" encoding="utf-8"?>
<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=" 正在載入..."
android:textColor="#999999"
android:textSize="15sp" />
</LinearLayout>三、注意事項
