android permissions need to be dynamically acquired

In Api 23, permissions need to be obtained dynamically, and core permissions must be satisfied. Standard process:

If the user clicks and does not prompt again , the system authorization pop-up window will not pop up. The process becomes:

That's all for the process, let's look at the code.

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1. Permissions

In AndroidManifest, add two permissions, record and modify volume .

    <!--危险权限-->
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>

    <!--一般权限-->
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

Dangerous permissions must be authorized, general permissions do not.

Check permission class

/**
 * 检查权限的工具类
 * <p/>
 * Created by wangchenlong on 16/1/26.
 */
public class PermissionsChecker {
    private final Context mContext;

    public PermissionsChecker(Context context) {
        mContext = context.getApplicationContext();
    }

    // 判断权限集合
    public boolean lacksPermissions(String... permissions) {
        for (String permission : permissions) {
            if (lacksPermission(permission)) {
                return true;
            }
        }
        return false;
    }

    // 判断是否缺少权限
    private boolean lacksPermission(String permission) {
        return ContextCompat.checkSelfPermission(mContext, permission) ==
                PackageManager.PERMISSION_DENIED;

---

2. Home

Assuming that the home page needs to use the permission, before the page is displayed, that is, when onResume, the permission is detected.
If it is missing, it will enter the permission acquisition page; after receiving the return value, when the permission is denied, it will be closed directly.

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE = 0; // 请求码

    // 所需的全部权限
    static final String[] PERMISSIONS = new String[]{
            Manifest.permission.RECORD_AUDIO,
            Manifest.permission.MODIFY_AUDIO_SETTINGS
    };

    @Bind(R.id.main_t_toolbar) Toolbar mTToolbar;

    private PermissionsChecker mPermissionsChecker; // 权限检测器

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        setSupportActionBar(mTToolbar);

        mPermissionsChecker = new PermissionsChecker(this);
    }

    @Override protected void onResume() {
        super.onResume();

        // 缺少权限时, 进入权限配置页面
        if (mPermissionsChecker.lacksPermissions(PERMISSIONS)) {
            startPermissionsActivity();
        }
    }

    private void startPermissionsActivity() {
        PermissionsActivity.startActivityForResult(this, REQUEST_CODE, PERMISSIONS);
    }

    @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // 拒绝时, 关闭页面, 缺少主要权限, 无法运行
        if (requestCode == REQUEST_CODE && resultCode == PermissionsActivity.PERMISSIONS_DENIED) {
            finish();
        }
    }
}

Core permissions must be satisfied, such as camera applications, camera permissions are necessary, if the user does not authorize, it will be closed directly.

---

3. Authorization page

Authorization page, first use the system default authorization page, when the user refuses, instruct the user to set manually, when the user fails again, return to the prompt. When the user manually exits the authorization page, send a notification of authorization failure to the user page.

/**
 * 权限获取页面
 * <p/>
 * Created by wangchenlong on 16/1/26.
 */
public class PermissionsActivity extends AppCompatActivity {

    public static final int PERMISSIONS_GRANTED = 0; // 权限授权
    public static final int PERMISSIONS_DENIED = 1; // 权限拒绝

    private static final int PERMISSION_REQUEST_CODE = 0; // 系统权限管理页面的参数
    private static final String EXTRA_PERMISSIONS =
            "me.chunyu.clwang.permission.extra_permission"; // 权限参数
    private static final String PACKAGE_URL_SCHEME = "package:"; // 方案

    private PermissionsChecker mChecker; // 权限检测器
    private boolean isRequireCheck; // 是否需要系统权限检测

    // 启动当前权限页面的公开接口
    public static void startActivityForResult(Activity activity, int requestCode, String... permissions) {
        Intent intent = new Intent(activity, PermissionsActivity.class);
        intent.putExtra(EXTRA_PERMISSIONS, permissions);
        ActivityCompat.startActivityForResult(activity, intent, requestCode, null);
    }

    @Override protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getIntent() == null || !getIntent().hasExtra(EXTRA_PERMISSIONS)) {
            throw new RuntimeException("PermissionsActivity需要使用静态startActivityForResult方法启动!");
        }
        setContentView(R.layout.activity_permissions);

        mChecker = new PermissionsChecker(this);
        isRequireCheck = true;
    }

    @Override protected void onResume() {
        super.onResume();
        if (isRequireCheck) {
            String[] permissions = getPermissions();
            if (mChecker.lacksPermissions(permissions)) {
                requestPermissions(permissions); // 请求权限
            } else {
                allPermissionsGranted(); // 全部权限都已获取
            }
        } else {
            isRequireCheck = true;
        }
    }

    // 返回传递的权限参数
    private String[] getPermissions() {
        return getIntent().getStringArrayExtra(EXTRA_PERMISSIONS);
    }

    // 请求权限兼容低版本
    private void requestPermissions(String... permissions) {
        ActivityCompat.requestPermissions(this, permissions, PERMISSION_REQUEST_CODE);
    }

    // 全部权限均已获取
    private void allPermissionsGranted() {
        setResult(PERMISSIONS_GRANTED);
        finish();
    }

    /**
     * 用户权限处理,
     * 如果全部获取, 则直接过.
     * 如果权限缺失, 则提示Dialog.
     *
     * @param requestCode  请求码
     * @param permissions  权限
     * @param grantResults 结果
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_CODE && hasAllPermissionsGranted(grantResults)) {
            isRequireCheck = true;
            allPermissionsGranted();
        } else {
            isRequireCheck = false;
            showMissingPermissionDialog();
        }
    }

    // 含有全部的权限
    private boolean hasAllPermissionsGranted(@NonNull int[] grantResults) {
        for (int grantResult : grantResults) {
            if (grantResult == PackageManager.PERMISSION_DENIED) {
                return false;
            }
        }
        return true;
    }

    // 显示缺失权限提示
    private void showMissingPermissionDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(PermissionsActivity.this);
        builder.setTitle(R.string.help);
        builder.setMessage(R.string.string_help_text);

        // 拒绝, 退出应用
        builder.setNegativeButton(R.string.quit, new DialogInterface.OnClickListener() {
            @Override public void onClick(DialogInterface dialog, int which) {
                setResult(PERMISSIONS_DENIED);
                finish();
            }
        });

        builder.setPositiveButton(R.string.settings, new DialogInterface.OnClickListener() {
            @Override public void onClick(DialogInterface dialog, int which) {
                startAppSettings();
            }
        });

        builder.show();
    }

    // 启动应用的设置
    private void startAppSettings() {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse(PACKAGE_URL_SCHEME + getPackageName()));
        startActivity(intent);
    }

Pay attention to the use of the isRequireCheck parameter to prevent overlapping with the system prompt box.
System authorization prompt: ActivityCompat.requestPermissions, ActivityCompat is compatible with lower versions.

Effect