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在我遇到这个实际问题之前,我一直认为启动页的作用是美化产品,提升软件逼格。但实际上,它更重要的是起到了一个拦截器的作用。比如,当App首页需要动态得从网上加载数据时,就必须请求网络权限,如果没有启动页,用户将直接看到一堆空数据。因此,启动页主要有两个作用:1、拦截用户访问,只有用户授予必要的权限才准入;2、为主页动态数据加载争取时间。
在提权限之前,首先把启动页延时跳转解决。通过下面的代码,可以实现延迟2秒钟跳转。
new android.os.Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent mainIntent = new Intent(Splash.this,MainActivity.class);
Splash.this.startActivity(mainIntent);
Splash.this.finish();
}
},2000);
另外注意把启动页的这个Activity在Manifests中设置成默认启动页面。
<activity android:name=".Splash"
android:theme="@style/ThemeSplash">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
启动页的xml使用默认的页面即可,这里通过引入主题的方式来设置启动页无标题栏,并更换底图。
在styles中添加:
<style name="ThemeSplash" parent="Theme.AppCompat.Light.NoActionBar">
<!--<item name="android:background">@mipmap/ic_launcher</item>-->
<item name="android:windowBackground">@drawable/qidong</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
首先在Manifests中配置需要的权限。
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <!-- 这个权限用于访问GPS定位 -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- 用于访问wifi网络信息,wifi信息会用于进行网络定位 -->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <!-- 获取运营商信息,用于支持提供运营商信息相关的接口 -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 这个权限用于获取wifi的获取权限,wifi信息会用来进行网络定位 -->
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <!-- 写入扩展存储,向扩展卡写入数据,用于写入离线定位数据 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- 访问网络,网络定位需要上网 -->
<uses-permission android:name="android.permission.INTERNET" />
然后在启动页的Java文件中,创建权限列表:
String[] permissions = new String[]{
Manifest.permission.ACCESS_COARSE_LOCATION, // GPS定位权限
Manifest.permission.ACCESS_FINE_LOCATION, // 访问wifi网络权限
Manifest.permission.ACCESS_WIFI_STATE, // 获取运营商权限
Manifest.permission.ACCESS_NETWORK_STATE, // 获取wifi定位权限
Manifest.permission.CHANGE_WIFI_STATE, // 存储权限
Manifest.permission.WRITE_EXTERNAL_STORAGE, // 访问网络权限
Manifest.permission.INTERNET // 网络权限
};
设定一个函数检查权限,全部通过才放行(这个条件可根据实际情况修改)
private void checkPermissions(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int q1 = ContextCompat.checkSelfPermission(getContext(), permissions[0]);
int q2 = ContextCompat.checkSelfPermission(getContext(), permissions[1]);
int q3 = ContextCompat.checkSelfPermission(getContext(), permissions[2]);
int q4 = ContextCompat.checkSelfPermission(getContext(), permissions[3]);
int q5 = ContextCompat.checkSelfPermission(getContext(), permissions[4]);
int q6 = ContextCompat.checkSelfPermission(getContext(), permissions[5]);
int q7 = ContextCompat.checkSelfPermission(getContext(), permissions[6]);
// 权限是否已经授权 GRANTED---授权 DINIED---拒绝
if (q1 != PackageManager.PERMISSION_GRANTED ||
q2 != PackageManager.PERMISSION_GRANTED ||
q3 != PackageManager.PERMISSION_GRANTED ||
q4 != PackageManager.PERMISSION_GRANTED ||
q5 != PackageManager.PERMISSION_GRANTED ||
q6 != PackageManager.PERMISSION_GRANTED ||
q7 != PackageManager.PERMISSION_GRANTED) {
// 如果没有授予该权限,就去提示用户请求
startRequestPermission();
}
else{
//获取权限成功,跳转
new android.os.Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent mainIntent = new Intent(Splash.this,MainActivity.class);
Splash.this.startActivity(mainIntent);
Splash.this.finish();
}
},2000);
}
}
}
如果用户点击拒绝,则引导用户进行权限请求。
private void startRequestPermission() {
ActivityCompat.requestPermissions(this, permissions, 321);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 321) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
//如果没有获取权限,那么可以提示用户去设置界面--->应用权限开启权限
Toast toast = Toast.makeText(this, "请到设置界面授予权限再启动", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
} else {
//获取权限成功,跳转
new android.os.Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent mainIntent = new Intent(Splash.this,MainActivity.class);
Splash.this.startActivity(mainIntent);
Splash.this.finish();
}
},2000);
}
}
}
}
Splash.java
package com.baidu.location.demo;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.content.Intent;
import android.view.Gravity;
import android.widget.Toast;
import static com.baidu.mapapi.BMapManager.getContext;
public class Splash extends AppCompatActivity {
String[] permissions = new String[]{
Manifest.permission.ACCESS_COARSE_LOCATION, // GPS定位权限
Manifest.permission.ACCESS_FINE_LOCATION, // 访问wifi网络权限
Manifest.permission.ACCESS_WIFI_STATE, // 获取运营商权限
Manifest.permission.ACCESS_NETWORK_STATE, // 获取wifi定位权限
Manifest.permission.CHANGE_WIFI_STATE, // 存储权限
Manifest.permission.WRITE_EXTERNAL_STORAGE, // 访问网络权限
Manifest.permission.INTERNET // 网络权限
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
checkPermissions();
}
private void checkPermissions(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int q1 = ContextCompat.checkSelfPermission(getContext(), permissions[0]);
int q2 = ContextCompat.checkSelfPermission(getContext(), permissions[1]);
int q3 = ContextCompat.checkSelfPermission(getContext(), permissions[2]);
int q4 = ContextCompat.checkSelfPermission(getContext(), permissions[3]);
int q5 = ContextCompat.checkSelfPermission(getContext(), permissions[4]);
int q6 = ContextCompat.checkSelfPermission(getContext(), permissions[5]);
int q7 = ContextCompat.checkSelfPermission(getContext(), permissions[6]);
// 权限是否已经授权 GRANTED---授权 DINIED---拒绝
if (q1 != PackageManager.PERMISSION_GRANTED ||
q2 != PackageManager.PERMISSION_GRANTED ||
q3 != PackageManager.PERMISSION_GRANTED ||
q4 != PackageManager.PERMISSION_GRANTED ||
q5 != PackageManager.PERMISSION_GRANTED ||
q6 != PackageManager.PERMISSION_GRANTED ||
q7 != PackageManager.PERMISSION_GRANTED) {
// 如果没有授予该权限,就去提示用户请求
startRequestPermission();
}
else{
//获取权限成功,跳转
new android.os.Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent mainIntent = new Intent(Splash.this,MainActivity.class);
Splash.this.startActivity(mainIntent);
Splash.this.finish();
}
},2000);
}
}
}
private void startRequestPermission() {
ActivityCompat.requestPermissions(this, permissions, 321);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 321) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
//如果没有获取权限,那么可以提示用户去设置界面--->应用权限开启权限
Toast toast = Toast.makeText(this, "请到设置界面授予权限再启动", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
} else {
//获取权限成功,跳转
new android.os.Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent mainIntent = new Intent(Splash.this,MainActivity.class);
Splash.this.startActivity(mainIntent);
Splash.this.finish();
}
},2000);
}
}
}
}
}
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