Android 动态权限申请
package com.dragon.android.permissionrequest; import android.Manifest; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.provider.Settings; import android.support.annotation.NonNull; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.widget.Toast; public class MainActivity extends AppCompatActivity { // 要申请的权限 private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE}; private AlertDialog dialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 版本判断。当手机系统大于 23 时,才有必要去判断权限是否获取 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { // 检查该权限是否已经获取 int i = ContextCompat.checkSelfPermission(this, permissions[0]); // 权限是否已经 授权 GRANTED---授权 DINIED---拒绝 if (i != PackageManager.PERMISSION_GRANTED) { // 如果没有授予该权限,就去提示用户请求 showDialogTipUserRequestPermission(); } } } // 提示用户该请求权限的弹出框 private void showDialogTipUserRequestPermission() { new AlertDialog.Builder(this) .setTitle("存储权限不可用") .setMessage("由于支付宝需要获取存储空间,为你存储个人信息;\n否则,您将无法正常使用支付宝") .setPositiveButton("立即开启", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { startRequestPermission(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).setCancelable(false).show(); } // 开始提交请求权限 private void startRequestPermission() { ActivityCompat.requestPermissions(this, permissions, 321); } // 用户权限 申请 的回调方法 @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) { // 判断用户是否 点击了不再提醒。(检测该权限是否还可以申请) boolean b = shouldShowRequestPermissionRationale(permissions[0]); if (!b) { // 用户还是想用我的 APP 的 // 提示用户去应用设置界面手动开启权限 showDialogTipUserGoToAppSettting(); } else finish(); } else { Toast.makeText(this, "权限获取成功", Toast.LENGTH_SHORT).show(); } } } } // 提示用户去应用设置界面手动开启权限 private void showDialogTipUserGoToAppSettting() { dialog = new AlertDialog.Builder(this) .setTitle("存储权限不可用") .setMessage("请在-应用设置-权限-中,允许支付宝使用存储权限来保存用户数据") .setPositiveButton("立即开启", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // 跳转到应用设置界面 goToAppSetting(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).setCancelable(false).show(); } // 跳转到当前应用的设置界面 private void goToAppSetting() { Intent intent = new Intent(); intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); Uri uri = Uri.fromParts("package", getPackageName(), null); intent.setData(uri); startActivityForResult(intent, 123); } // @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 123) { if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { // 检查该权限是否已经获取 int i = ContextCompat.checkSelfPermission(this, permissions[0]); // 权限是否已经 授权 GRANTED---授权 DINIED---拒绝 if (i != PackageManager.PERMISSION_GRANTED) { // 提示用户应该去应用设置界面手动开启权限 showDialogTipUserGoToAppSettting(); } else { if (dialog != null && dialog.isShowing()) { dialog.dismiss(); } Toast.makeText(this, "权限获取成功", Toast.LENGTH_SHORT).show(); } } } } }
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>