package com.xiao.filetest;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivityextends AppCompatActivity {
private final static String[]PERMISSIONS=new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.ACCESS_FINE_LOCATION};
private final static int REQUEST_CODE_PERMISSION=1;
private final static int REQUEST_CODE_SETTINGS=2;
private TextViewtextView;
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode ==REQUEST_CODE_SETTINGS) {
recreate();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=findViewById(R.id.id_text_view);
if(requestPermission(PERMISSIONS)){//请求权限
continueNext();//继续运行程序
}
}
private void continueNext() {
//获得权限后，继续运行的代码
textView.setText("成功");
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
boolean valid=true;
for(String permission:permissions){
if(!shouldShowRequestPermissionRationale(permission)) valid=false; //某项权限被禁止并不再询问
}
if (valid) {
recreate();//如果某项权限没通过，刷新本页，会继续请求
}else {
//某项权限被禁止并不再询问，则转到程序的设置页
new AlertDialog.Builder(this).setMessage("正常运行本程序，需要某些权限，请设置！").setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent intent =new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + getPackageName()));
startActivityForResult(intent,REQUEST_CODE_SETTINGS);
}
}).show();
}
}
private boolean requestPermission(String[] permissions){
boolean valid=true;
List requestPermissions=new ArrayList<>();
for(String permission:permissions){
if(ActivityCompat.checkSelfPermission(this,permission)!= PackageManager.PERMISSION_GRANTED){
requestPermissions.add(permission);
valid=false;
}
}
if(requestPermissions.size()>0){
ActivityCompat.requestPermissions(this,requestPermissions.toArray(new String[requestPermissions.size()]),REQUEST_CODE_PERMISSION);
}
return valid;
}
}
