Android 用Activity实现加载等待界面

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实现加载等待界面我用了两种方式，一种是用PopupWindow实现，另一种便是用Activity实现。用PopupWindow实现方法请见我的另一篇博客：

用PopupWindow实现加载等待界面

好了，下面开始。先上效果：

基本原理就是在主界面点击按钮（以登录按钮为例）之后，打开一个新的Activity，此Activity以对话框形式展示。首先，主界面（一个登录按钮以及它的监听事件）：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.toprs.waitingpractice.MainActivity">

    <Button
        android:text="登录"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="loginClick"
        android:id="@+id/button2"/>
</LinearLayout>

MainActivity.java

package com.toprs.waitingpractice;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void loginClick(View v){
        Intent intent = new Intent();
        intent.setClass(MainActivity.this,WaitingActivity.class);
        startActivity(intent);
    }
}

接下来是弹出的新Activity，新的Activity及其布局：

waiting_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.toprs.waitingpractice.MainActivity">

    <Button
        android:text="登录"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="loginClick"
        android:id="@+id/button2"/>
</LinearLayout>

WaitingActivity.java

package com.tow.waitingpractice;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.Toast;

/**
 * Created by 39867 on 2017/4/18.
 */

public class WaitingActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.loading_activity);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                WaitingActivity.this.finish();
                Toast.makeText(WaitingActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
            }
        },2000);
    }
}

OK，运行一下试试吧。