android请求调用操作的运行时权限

Question

我有用于调用操作的代码，并且我需要声明运行时权限的最佳方式IVE我尝试了许多代码，但我始终会出错

这是我的基本代码，任何有关使其具有运行时权限的建议，请先谢谢

public class MainActivity extends Activity {

private Button button;
private EditText etPhoneno;

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    button = (Button) findViewById(R.id.buttonCall);
    etPhoneno = (EditText) findViewById(R.id.editText1);
    // add button listener
    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
                String phnum = etPhoneno.getText().toString();
                Intent callIntent = new Intent(Intent.ACTION_CALL);
                callIntent.setData(Uri.parse("tel:" + phnum));
                startActivity(callIntent);
        }
    });
}

}

Answer 1

在您的onClick()方法中尝试此代码

if(isPermissionGranted()){
     call_action();
}

现在，调用创建一个单独的方法：

public void call_action(){
    String phnum = etPhoneno.getText().toString();
    Intent callIntent = new Intent(Intent.ACTION_CALL);
    callIntent.setData(Uri.parse("tel:" + phnum));
    startActivity(callIntent);
   }

添加以下两种用于运行时权限检查的方法：

 public  boolean isPermissionGranted() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(android.Manifest.permission.CALL_PHONE)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v("TAG","Permission is granted");
            return true;
        } else {

            Log.v("TAG","Permission is revoked");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CALL_PHONE}, 1);
            return false;
        }
    }
    else { //permission is automatically granted on sdk<23 upon installation
        Log.v("TAG","Permission is granted");
        return true;
    }
}


 @Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {

        case 1: {

            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(), "Permission granted", Toast.LENGTH_SHORT).show();
                call_action();
            } else {
                Toast.makeText(getApplicationContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
 }

还要确保将其添加到清单中：

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

碎片

如果您在中尝试使用此代码 fragment ，请更改

checkSelfPermission()

至

ActivityCompat.checkSelfPermission()

并且也改变

ActivityCompat.requestPermissions()

至

requestPermissions()