做另一面的自己

Android Api 23+ 权限请求问题

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如申请 ==PERMISSION_REQUEST_READ_STORAGE==为例。

1.在AndroidManifest申请权限

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

这样要是在Api 23以下的机器，权限申请工作就算完成了。

2.onCreate 中检查权限是否被赋予，

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if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {
            startMainActivity();
    }

3.如果权限没有被申请，开始申请权限

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ActivityCompat.requestPermissions(
                this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                PERMISSION_REQUEST_READ_STORAGE);

这个方法的注释非常详细，可以查看api文档。

4.这个activity实现ActivityCompat.OnRequestPermissionsResultCallback接口，用户点击是否授权会有回调方法：

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/*
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(
            int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        String permissionResult = "Request code: " + requestCode + ", Permissions: " + permissions
                + ", Results: " + grantResults;
        Log.d(TAG, "onRequestPermissionsResult(): " + permissionResult);
        if (requestCode == PERMISSION_REQUEST_READ_STORAGE) {
            // Close activity regardless of user's decision (decision picked up in main activity).
            startMainActivity();
        }
    }