Android 6.0RunTime Permission完美解決方案

在6.0中須要動態獲取權限，而在動態獲取權限的時候，默認提示框包含不在提示按鈕，一旦用戶勾選了不在提示，那麼默認的系統提示框就不會再出現，所以咱們須要自定義系統提示框。

在Api 23中, 權限須要動態獲取, 核心權限必須知足. 標準流程: 

下面咱們以讀取文件權限爲例，演示對動態權限獲取的解決方案.

1 、 權限檢測工具

public class PermissionHelper {

    private Context mContext;
    public static final String PACKAGE = "package:";

    public PermissionHelper(Context context) {
        this.mContext = context;
    }

    /**
     * 判斷權限集合
     *
     * @param permissions 檢測權限的集合
     * @return 權限已所有獲取返回true，未所有獲取返回false
     */
    public boolean checkPermissions(String... permissions) {
        for (String permission : permissions) {
            if (!checkPermission(permission)) {
                return false;
            }
        }
        return true;
    }

    /**
     * 判斷權限是否獲取
     *
     * @param permission 權限名稱
     * @return 已受權返回true，未受權返回false
     */
    public boolean checkPermission(String permission) {
        return ContextCompat.checkSelfPermission(mContext, permission) == PackageManager.PERMISSION_GRANTED;
    }


    /**
     * 獲取權限
     *
     * @param resultCode
     * @return
     */
    public void permissionsCheck(String permission, int resultCode) {
        // 注意這裏要使用shouldShowRequestPermissionRationale而不要使用requestPermission方法
        // 由於requestPermissions方法會顯示不在詢問按鈕
        if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) mContext, permission)) {
            //若是用戶之前拒絕過改權限申請，則給用戶提示
            showMissingPermissionDialog();
        } else {
            //進行權限請求
            ActivityCompat.requestPermissions((Activity) mContext,
                    new String[]{permission},
                    resultCode);
        }
//        ActivityCompat.requestPermissions((Activity) mContext, new String[]{permission},resultCode);
    }


    // 顯示缺失權限提示
    private void showMissingPermissionDialog() {

        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        final AlertDialog alertDialog = builder.create();

        builder.setMessage("當前應用缺乏必要權限。\n\n請點擊\"設置\"-\"權限\"-打開所需權限。\n\n最後點擊兩次後退按鈕，便可返回。");
        // 拒絕, 退出應用
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override public void onClick(DialogInterface dialog, int which) {
                alertDialog.dismiss();
            }
        });

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

        builder.show();
    }

    // 啓動應用的設置
    public void startAppSettings() {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse( PACKAGE + mContext.getPackageName()));
        mContext.startActivity(intent);
    }
}

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二、主界面 
假設進入主界面的時候須要獲取到文件訪問權限,獲取成功的話，進入另外一個Activity，在onResume()方法中判斷獲取權限狀態。

public class MainActivity extends AppCompatActivity {

    //返回值
    private static final int  WRITE_RESULT_CODE = 12;
    //權限名稱
    private static final String  WRITE_PERMISSION = Manifest.permission.WRITE_EXTERNAL_STORAGE;

    //權限檢測類
    private PermissionHelper mPermissionHelper;

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

        mPermissionHelper = new PermissionHelper(this);
    }

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

        //判斷權限受權狀態
        boolean b = mPermissionHelper.checkPermission(WRITE_PERMISSION);

        //若是沒有獲取到權限,則嘗試獲取權限
        if (!b){
            mPermissionHelper.permissionsCheck(WRITE_PERMISSION,WRITE_RESULT_CODE);
        }else{
            //若是請求成功，則進行相應的操做，好比咱們這裏打開一個新的Activity
            Intent intent = new Intent(MainActivity.this,PermissionActivity.class);
            startActivity(intent);
        }

    }


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

        switch(requestCode){
            case WRITE_RESULT_CODE:
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    //若是請求成功，則進行相應的操做，好比咱們這裏打開一個新的Activity
                    Intent intent = new Intent(MainActivity.this,PermissionActivity.class);
                    startActivity(intent);

                } else {
                    //若是請求失敗
                    mPermissionHelper.startAppSettings();
                }
                break;
        }
    }
}

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代碼地址:http://download.csdn.net/detail/u011068996/9421242