安卓开发之限权管理

Posted 2021-02-18 p-t-m

在程序运行时申请限权(CALL_PHONE),CALL_PHONE这个限权是编写拨打电话功能的时候需要声明的,安卓6.0之后的,实现,在布局文件中添加

<uses-permission android:name="android.permission.CALL_PHONE"/>声明其限权

之后在MainActivity.class中添加代码

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button makeCall =(Button)findViewById(R.id.make_call);
        makeCall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
                        permission.CALL_PHONE)!= PackageManager.PERMISSION_GRANTED){
                        ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.CALL_PHONE},1);

                }else{
                    call();
                }
            }
        });
    }

checkSelfPermission()方法接受两个参数,一个是context,另一个参数是接受的限权名,打电话的限权名是Manifest.permission.CALL_PHONE,然后我们使用方法的返回值和PackageManager.GRANETED进行比较,相等说明授权了,不相等就表示用户没有授权

private void cal(){

try{
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:10086"));
startActivity(intent);
}catch(SecurityEXception e){
  e.printStackTrace();  
}
}

call()方法

@Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                          int[] grantResults){
        switch(requestCode){
            case 1:
                if(grantResults.length >0 && grantResults[0] == PackageManager
                        .PERMISSION_GRANTED){
                    call();

                }else{
                    Toast.makeText(this,"You denied the permission",Toast.LENGTH_SHORT).show();
                }
            break;
            default:
        }

    }

用户允许该线圈,上面的requesCode是请求码,permission是申请的限权,grantResults是请求的结果.