引用其他文件中的方法答案

【问题标题】：referencing methods in other files引用其他文件中的方法
【发布时间】：2017-12-03 22:00:07
【问题描述】：

我正在尝试在permissionsSMSHelper 类中使用getPermissiontoReadSMS 和onRequestPermissionsResult 方法。当我在 newMessagePage.java 文件和homePage.java 文件的onCreate 方法中引用它们时，它每次都会给我“无法解析方法”错误。我无法弄清楚出了什么问题。如果有人可以提供帮助，我将不胜感激。

permissionsSMSHelper.java

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.widget.Toast;

public class permissionsSMSHelper extends homePage {

public int READ_SMS_PERMISSIONS_REQUEST;

public permissionsSMSHelper(int req) {
    READ_SMS_PERMISSIONS_REQUEST = req;
}

public void getPermissionToReadSMS(int reqVal) {
    READ_SMS_PERMISSIONS_REQUEST = reqVal;

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS)
            != PackageManager.PERMISSION_GRANTED) {
        if (shouldShowRequestPermissionRationale(
                Manifest.permission.READ_SMS)) {
            Toast.makeText(this, "Please allow permission", Toast.LENGTH_SHORT).show();
        }
        requestPermissions(new String[]{Manifest.permission.READ_SMS}, reqVal);
    }
}

public RequestPermissionsResult(int req) {
    READ_SMS_PERMISSIONS_REQUEST = req;
}

public void onRequestPermissionsResult(int requestCode,
                                       int requestNum,
                                       @NonNull String permissions[],
                                       @NonNull int[] grantResults) {
    READ_SMS_PERMISSIONS_REQUEST= requestNum;

    if(requestCode == requestNum) {
        if(grantResults.length == 1 &&
                grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "Read SMS permission granted", Toast.LENGTH_SHORT).show();
            refreshSmsInbox();
        }else {
            Toast.makeText(this, "Read SMS permission denied", Toast.LENGTH_SHORT).show();
        }
    }else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}
}

homePage.java

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

        mDrawerList = (ListView)findViewById(R.id.navList);
        mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);

        messages = (ListView) findViewById(R.id.messages);
        arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, smsMessagesList);
        messages.setAdapter(arrayAdapter);

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

            permissionsSMSHelper SMScheck = new permissionsSMSHelper(1);

            SMScheck.getPermissionToReadSMS(1);
            SMScheck.onRequestPermissionsResult(1);

        }else {
            refreshSmsInbox();
        }

        addDrawerItems();
        FABListener();
    }

newMessagePage.java

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.v4.content.ContextCompat;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class newMessagePage extends homePage {

SmsManager smsManager = SmsManager.getDefault();
EditText input;

public void onSendClick(View view) {

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

        permissionsSMSHelper SMScheck = new permissionsSMSHelper(1);

        SMScheck.getPermissionToReadSMS(1);
        SMScheck.onRequestPermissionsResult(1);

    }else {

        smsManager.sendTextMessage("17739965441", null, input.getText().toString(), null, null);
        Toast.makeText(this, "Message sent!", Toast.LENGTH_SHORT).show();
    }
}

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

    input = (EditText) findViewById(R.id.input);
}
}

【问题讨论】：

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标签： java android oop methods

【解决方案1】：

你做错了。您所谓的PermissionsSMSHelper 类正在扩展HomePage，并且您正在HomePage 中创建permissionsSMSHelper 的实例，并且在NewMessagePage 的情况下，您间接引用了另一个类中的活动，这将导致在内存泄漏中。从 PermissionsSMSHelper 中删除 extends homePage 并在构造函数中传递 Context 或在 PermissonsSMSHelper 中将方法设为静态并在每个方法调用中传递 Context。 您的命名约定太糟糕了

【讨论】：