Question

我创建了一个标签布局。我想创建一个可调用的数字，我必须定义onCLickListener，请参阅下面Tab2中编写的代码：在这个错误中显示MainActivity.this不是一个封闭的类，那么我应该写什么呢？（tab2.xml是Tab的布局文件的名称）

package com.firstapp.admin.herbalteaco;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;

import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

/**
 * Created by admin on 11/25/2017.
 */

public class Tab2 extends Fragment implements View.OnClickListener{


private TextView tvCall;
private Button btnLogin;


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.tab2 , container , false);

}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    btnLogin = (Button) btnLogin.findViewById(R.id.btnLogin);
    btnLogin.setOnClickListener(this);

    tvCall = (TextView) tvCall.findViewById(R.id.tvCall);
    tvCall.setOnClickListener((new View.OnClickListener() {
        public void onClick(View arg0) {
            Intent callIntent = new Intent(Intent.ACTION_CALL);
            callIntent.setData(Uri.parse("tel:+91999999999"));;
            if (ActivityCompat.checkSelfPermission( MainActivity.this,
                    Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            startActivity(callIntent);
        }
    }));

}

Answer 1

尝试以下代码

定义Global vairable，如下所示

int REQUEST_CALL=101;

请求权限，如下所示

if (ActivityCompat.checkSelfPermission(getContext(),
                    android.Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(getActivity(),
                new String[]{android.Manifest.permission.CALL_PHONE},
                REQUEST_CALL);
    } else {
        Log.e("DB", "PERMISSION GRANTED");
        // do your call 

    }

请勿忘记处理如下所示的请求权限

@Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    if(requestCode == REQUEST_CALL){
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // Call task you need to do.

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
        }
    }

Answer 2

您可以在扩展logger.info( " key :value {}" + e.getKey(), e.getValue()); or logger.info( " key :value {} {}" , e.getKey() , e.getValue());的类中调用getActivity()。这将为您提供拥有该片段的Fragment实例。由于Activity是Activity的子类，因此您可以在需要Context的任何位置使用此实例。

无法使用TabLayout中的调用函数进行调用

2 个答案: