EasyPermissions android 权限申请

android 框架编程之 EasyPermissions

转载[来自一个用户的文章](https://www.cnblogs.com/renhui/p/10976493.html#_label3）

1.使用EasyPermissions 检查权限；（如果没有权限则进行第二部）
2.使用EasyPermissions 请求权限；（请求权限后，会出现1.用户给权限；2.用户不给权限，所以需要第三步，请求权限的结果）
3.EasyPermissions ，相应权限结果；
4.@AfterPermissionGranted

还未写完，下次继续

自己应用程序中的代码

package feng.obu.ui.login;

import android.app.Activity;

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;

import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import androidx.appcompat.app.AppCompatActivity;

import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

import feng.obu.MainActivity;
import feng.obu.R;
import feng.obu.Utils;
import feng.obu.ui.login.LoginViewModel;
import feng.obu.ui.login.LoginViewModelFactory;
import pub.devrel.easypermissions.AppSettingsDialog;
import pub.devrel.easypermissions.EasyPermissions;

public class LoginActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks {

    private LoginViewModel loginViewModel;
    String [] permsList={"android.permission.BLUETOOTH",
            "android.permission.BLUETOOTH_ADMIN",
            "android.permission.INTERNET",
           // "android.permission.ACCESS_LOCATION",
            "android.permission.ACCESS_FINE_LOCATION"};


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        Boolean flag=EasyPermissions.hasPermissions(this,permsList);
        if(!flag){
            EasyPermissions.requestPermissions(this,"有以下权限才能正常使用",220,permsList);;
        }
        loginViewModel = ViewModelProviders.of(this, new LoginViewModelFactory())
                .get(LoginViewModel.class);

        final EditText usernameEditText = findViewById(R.id.username);
        final EditText passwordEditText = findViewById(R.id.password);
        final Button loginButton = findViewById(R.id.login);
        final ProgressBar loadingProgressBar = findViewById(R.id.loading);

        loginViewModel.getLoginFormState().observe(this, new Observer<LoginFormState>() {
            @Override
            public void onChanged(@Nullable LoginFormState loginFormState) {
                if (loginFormState == null) {
                    return;
                }
                loginButton.setEnabled(loginFormState.isDataValid());
                if (loginFormState.getUsernameError() != null) {
                    usernameEditText.setError(getString(loginFormState.getUsernameError()));
                }
                if (loginFormState.getPasswordError() != null) {
                    passwordEditText.setError(getString(loginFormState.getPasswordError()));
                }
            }
        });

        loginViewModel.getLoginResult().observe(this, new Observer<LoginResult>() {
            @Override
            public void onChanged(@Nullable LoginResult loginResult) {
                if (loginResult == null) {
                    return;
                }
                loadingProgressBar.setVisibility(View.GONE);
                if (loginResult.getError() != null) {
                    showLoginFailed(loginResult.getError());
                }
                if (loginResult.getSuccess() != null) {
                    updateUiWithUser(loginResult.getSuccess());
                }
                setResult(Activity.RESULT_OK);
                startActivity(new Intent(LoginActivity.this, MainActivity.class));


                //Complete and destroy login activity once successful
                finish();
            }
        });

        TextWatcher afterTextChangedListener = new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // ignore
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // ignore
            }

            @Override
            public void afterTextChanged(Editable s) {
                loginViewModel.loginDataChanged(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString());
            }
        };
        usernameEditText.addTextChangedListener(afterTextChangedListener);
        passwordEditText.addTextChangedListener(afterTextChangedListener);
        passwordEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_DONE) {
                    loginViewModel.login(usernameEditText.getText().toString(),
                            passwordEditText.getText().toString());
                }
                return false;
            }
        });

        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Boolean flag=EasyPermissions.hasPermissions(LoginActivity.this,permsList);
                if(!flag){
                    EasyPermissions.requestPermissions(LoginActivity.this,"正常使用需要开启权限哦！",220,permsList);
                    return;
                }

                if(!Utils.getBluetoothisEnabled(LoginActivity.this)){
                    Utils.opendBluetooth();
                    return;
                }



                loadingProgressBar.setVisibility(View.VISIBLE);
                loginViewModel.login(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString());
            }
        });


        ActionBar actionBar = getSupportActionBar();
        if(actionBar!=null){
            actionBar.hide();
        }
        if(actionBar!=null){
            actionBar.setIcon(R.drawable.ic_home_index);
            actionBar.setLogo(R.drawable.icon_pwd);
//            actionBar.setTitle("主标题");
        }
    }



    private void updateUiWithUser(LoggedInUserView model) {
        String welcome = getString(R.string.welcome) + model.getDisplayName();
        // TODO : initiate successful logged in experience
        Toast.makeText(getApplicationContext(), welcome, Toast.LENGTH_LONG).show();
    }

    private void showLoginFailed(@StringRes Integer errorString) {
        Toast.makeText(getApplicationContext(), errorString, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) {

    }

    @Override
    public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) {

        if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
            new AppSettingsDialog.Builder(this).build().show();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

         EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }
}