Android—运行时权限获取举例

Android6.0以后的某些权限需要动态申请，下面以一个打电话/获取手机联系人的权限为例，了解其具体实现。

获取打电话权限

AndroidManifest.xml中增加权限配置

<uses-permission-sdk-23 android:name="android.permission.CALL_PHONE"/>

MainActivity中的实现代码

public class MainActivity extends AppCompatActivity {


    private Button button;

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

        button = (Button) findViewById(R.id.call_phone);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {

                    ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.CALL_PHONE},1);

                }else {

                    call();
                    
                }
            }
        });
    }


    @SuppressLint("MissingPermission")
    private void call() {

        try {

            Intent intent = new Intent(Intent.ACTION_CALL);

            intent.setData(Uri.parse("tel:10086"));

            startActivity(intent);

        }catch (Exception e){

            e.printStackTrace();

        }

    }


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

        switch (requestCode){
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){

                    call();

                }else {

                    Toast.makeText(MainActivity.this,"you denied the permission",Toast.LENGTH_SHORT).show();

                }

                break;
            default:
        }
    }
}

获取联系人信息

权限配置

<uses-permission-sdk-23 android:name="android.permission.READ_CONTACTS" />

具体实现

public class MainActivity extends AppCompatActivity {


    private ListView listView;

    ArrayAdapter<String> adapter;

    List<String> contacts = new ArrayList<>();

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

        listView = (ListView)findViewById(R.id.listview);

        adapter = new ArrayAdapter<String>(this,R.layout.item,contacts);

        listView.setAdapter(adapter);

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED){

            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CONTACTS},1);

        }else {

            readContacts();

        }
    }


    public  void readContacts(){

        Cursor cursor = null;

        try {

            //查询联系人数据
            cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);

            if (cursor != null){

                while (cursor.moveToNext()){

                    //获取联系人姓名
                    String displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));

                    //获取联系人号
                    String displayNumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                    contacts.add(displayName+"\n"+displayNumber);
                }

                adapter.notifyDataSetChanged();

            }

        }catch (Exception e){

            e.printStackTrace();

        }finally {

            if (cursor != null){

                cursor.close();

            }

        }

    }


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

        switch (requestCode){

            case 1:

                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){

                    readContacts();

                }else {

                    Toast.makeText(this,"you denied permission",Toast.LENGTH_LONG).show();

                }

                break;

            default:

        }

    }
}