实现Android App直呼

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

String phoneNumber = "电话号码";
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + phoneNumber));

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED) {
    // 已经获取了权限，可以直接拨打电话
    startActivity(intent);
} else {
    // 未获取权限，需要请求权限
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CALL_PHONE}, REQUEST_CALL_PHONE_PERMISSION);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == REQUEST_CALL_PHONE_PERMISSION) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // 用户授予了拨打电话的权限，可以直接拨打电话
            startActivity(intent);
        } else {
            // 用户拒绝了拨打电话的权限，可以给出相应的提示
            Toast.makeText(this, "未授予拨打电话的权限", Toast.LENGTH_SHORT).show();
        }
    }
}