新建一个Android工程，在布局文件里面加入一个拨打电话按钮。
点击拨打电话之后，弹出对话框让用户选择是否允许申请权限。
当用户点击YES之后，就向系统申请权限。
布局文件如下，在布局文件中加入按钮，同时注册响应事件，callButtonClickAction：
Manifest.xml文件，添加android.permission.CALL_PHONE打电话的权限。
下面是MainActivity.java的代码，注意看代码注释，注释写的很详细
import android.Manifest;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import comnii.activity.type.RequestPermissionType;
import comnii.activity.util.DialogUtil;
public class MainActivity extends AppCompatActivity
{
private Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.mContext = this;
}
public void callButtonClickAction(View view)
{
//先new出一个监听器，设置好监听
DialogInterface.OnClickListener dialogOnclicListener = new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
switch (which)
{
case Dialog.BUTTON_POSITIVE:
Toast.makeText(MainActivity.this, "Yes" + which, Toast.LENGTH_SHORT).show();
requestPermission();
break;
case Dialog.BUTTON_NEGATIVE:
Toast.makeText(MainActivity.this, "No" + which, Toast.LENGTH_SHORT).show();
break;
case Dialog.BUTTON_NEUTRAL:
Toast.makeText(MainActivity.this, "Cancel" + which, Toast.LENGTH_SHORT).show();
break;
}
}
};
//弹窗让用户选择，是否允许申请权限
DialogUtil.showConfirm(mContext, "申请权限", "是否允许获取打电话权限？", dialogOnclicListener, dialogOnclicListener);
}
private void requestPermission()
{
//判断Android版本是否大于23
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
int checkCallPhonePermission = ContextCompat.checkSelfPermission(mContext, Manifest.permission.CALL_PHONE);
if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CALL_PHONE},
RequestPermissionType.REQUEST_CODE_ASK_CALL_PHONE);
return;
}
else
{
callPhone();
}
}
else
{
callPhone();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults)
{
switch (requestCode)
{
case RequestPermissionType.REQUEST_CODE_ASK_CALL_PHONE:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
callPhone();
}
else
{
// Permission Denied
Toast.makeText(MainActivity.this, "CALL_PHONE Denied", Toast.LENGTH_SHORT).show();
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void callPhone()
{
Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:10086"));
startActivity(intent);
}
}
DialogUtil,java是是弹窗工具类
package comnii.activity.util;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.WindowManager;
public class DialogUtil
{
public static AlertDialog showAlert(Context context, String title, String message,
String confirmButton, DialogInterface.OnClickListener confirmButtonClickListener,
String centerButton, DialogInterface.OnClickListener centerButtonClickListener,
String cancelButton, DialogInterface.OnClickListener cancelButtonClickListener,
DialogInterface.OnShowListener onShowListener, boolean cancelable,
DialogInterface.OnCancelListener onCancelListener,
DialogInterface.OnDismissListener onDismissListener)
{
AlertDialog.Builder promptBuilder = new AlertDialog.Builder(context);
if (title != null)
{
promptBuilder.setTitle(title);
}
if (message != null)
{
promptBuilder.setMessage(message);
}
if (confirmButton != null)
{
promptBuilder.setPositiveButton(confirmButton, confirmButtonClickListener);
}
if (centerButton != null)
{
promptBuilder.setNeutralButton(centerButton, centerButtonClickListener);
}
if (cancelButton != null)
{
promptBuilder.setNegativeButton(cancelButton, cancelButtonClickListener);
}
promptBuilder.setCancelable(true);
if (cancelable)
{
promptBuilder.setOnCancelListener(onCancelListener);
}
AlertDialog alertDialog = promptBuilder.create();
if (!(context instanceof Activity))
{
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
}
alertDialog.setOnDismissListener(onDismissListener);
alertDialog.setOnShowListener(onShowListener);
alertDialog.show();
return alertDialog;
}
public static AlertDialog showConfirm(Context context, String title, String message,
DialogInterface.OnClickListener confirmButtonClickListener,
DialogInterface.OnClickListener cancelButtonClickListener)
{
return showAlert(context, title, message, "Yes",
confirmButtonClickListener, null, null, "No", cancelButtonClickListener, null, true, null, null);
}
public static AlertDialog showPrompt(Context context, String message, String confirmButton)
{
return showAlert(context, null, message, confirmButton, null, null, null, null, null, null, true, null, null);
}
public static AlertDialog showPrompt(Context context, String message)
{
return showAlert(context, null, message, "OK", null, null, null, null, null, null, true, null, null);
}
}
RequestPermissionType.java是申请的权限Code
public interface RequestPermissionType
{
int REQUEST_CODE_ASK_CALL_PHONE = 100;
}