Android 动态权限申请

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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();                 }             }         }     } }

　　

 

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1	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>