如何请求允许从 Android 版本 Marshmallow 开始从 Android 进行 phone 调用？

Question

我正在尝试从 Android 进行 phone 调用，并且我还设置了运行时间权限。并询问是否允许进行 phone 调用。但是当我按下允许时，应用程序崩溃了：

我是这样实现的：

private static final int REQUEST_PHONE_CALL = 1;
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + "+918511812660"));

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
    }
    else
    {
        startActivity(intent);
    }
}
else
{
    startActivity(intent);
}

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

            }
            return;
        }
    }
}

这是我在logcat中获得的：

java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, 
     request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} 
     to activity {com.devpost.airway/com.devpost.airway.activities.MainActivity}: 
     java.lang.NullPointerException: Attempt to invoke virtual method 
     'java.lang.String android.content.Intent.toString()' on a null object reference

      at android.app.ActivityThread.deliverResults(ActivityThread.java:3733)
      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3776)
      at android.app.ActivityThread.-wrap16(ActivityThread.java)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loop(Looper.java:148)
      at android.app.ActivityThread.main(ActivityThread.java:5461)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 
    'java.lang.String android.content.Intent.toString()' on a null object reference
      at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485)
      at android.app.Activity.startActivityForResult(Activity.java:3930)
      at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
      at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:75)
      at android.app.Activity.startActivityForResult(Activity.java:3890)
      at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:856)
      at android.app.Activity.startActivity(Activity.java:4213)
      at android.app.Activity.startActivity(Activity.java:4181)
      at com.devpost.airway.activities.MainActivity.onRequestPermissionsResult(MainActivity.java:140)
      at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6582)
      at android.app.Activity.dispatchActivityResult(Activity.java:6460)
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3729)
      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3776) 
      at android.app.ActivityThread.-wrap16(ActivityThread.java) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:148) 
      at android.app.ActivityThread.main(ActivityThread.java:5461) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

可能是什么原因造成的？

Answer 1

添加新方法

public static boolean hasPermissions(Context context, String... permissions) {
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
    for (String permission : permissions) {
        if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
            return false;
        }
    }
}
return true;
}

在全局中添加这个

int PERMISSION_ALL = 1; 
String[] PERMISSIONS = {Manifest.permission.READ_CONTACTS, Manifest.permission.CALL_PHONE};

并在 onCreate

中写入以下代码

if(!hasPermissions(this, PERMISSIONS)){
ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
}

Answer 2

堆栈跟踪似乎表明您的权限流工作正常，但从 onRequestPermissionsResult() 调用 startActivity 时崩溃了。您传递给 startActivity 的 Intent 是否设置正确？我看不到它在那部分代码中设置。

另请注意，ContextCompat.checkSelfPermission 会代表您处理 SDK 版本检查，因此您应该能够使用

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

单独使用，没有包装 SDK 版本检查代码。

Answer 3

将您的 onRequestPermissionsResult 更改为以下内容，您基本上需要先创建 intent ，然后在获得许可后调用它。这就是你做错的地方。

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case REQUEST_PHONE_CALL : {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + "+918511812660"));

                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED) {
                    startActivity(intent);
                }
            }
        }
    }
}

Answer 4

您需要在 onRequestPermissionsResult

中创建您的 Intent


@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case REQUEST_PHONE_CALL: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + "+918511812660"));
                startActivity(intent);
            }
            else
            {

            }
            return;
        }
    }
}

Answer 5

我建议在构建 Intent to call a particular number 时使用 ACTION_DIAL 而不是 ACTION_CALL。使用 ACTION_DIAL ，您的应用程序中不需要呼叫权限，因为 ACTION_DIAL 使用已输入的号码打开拨号器，并进一步允许用户决定是实际拨打电话还是修改 phone 呼叫前的号码或根本不呼叫。

Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + "Your Phone_number"));// Initiates the Intent 
startActivity(intent);

Answer 6

 private void makePhoneCall() {
    String number = items;
    if (number.trim().length() > 0) {
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.CALL_PHONE}, REQUEST_CALL);
        } else {
            String dial = "tel:" + number;
            startActivity(new Intent(Intent.ACTION_CALL, Uri.parse(dial)));
        }
    } else {
        Toast.makeText(MainActivity.this, "Enter Phone Number", Toast.LENGTH_SHORT).show();
    }
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == REQUEST_CALL) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            makePhoneCall();
        } else {
            Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show();
        }
    }
}

Answer 7

最好不要对该操作使用 phone_call 权限。 Google Play 控制台会提醒您，您应该避免向用户请求不必要的许可。这是一个更好的方法：

/**
 * Make a phone call. Send to the phone app
 *
 * @param phoneNumber the phone number to call
 */
private fun performPhoneCall(phoneNumber: String) {
    val intent = Intent(Intent.ACTION_DIAL)
    intent.data = Uri.parse("tel:$phoneNumber")
    try {
        context.startActivity(intent)
    } catch (ex: Exception) {
        displayErrorMessage()
    }
}

如何请求允许从 Android 版本 Marshmallow 开始从 Android 进行 phone 调用？

How to ask permission to make phone call from Android from Android version Marshmallow onwards?

java

android

phone-call

runtime-permissions