Question

当用户在另一个班级的AlertDialog中选择退出选项时，我正在尝试完成我的活动。但是，当我尝试使用getApplicationContext()时，我收到此错误

The method getApplicationContext() is undefined for the type new DialogInterface.OnClickListener(){}

和错误

The method startActivity(Intent) is undefined for the type new DialogInterface.OnClickListener(){}

代表StartActivity(intent)。任何建议都会很棒。感谢

new AlertDialog.Builder(context)
.setTitle("End Option ")
.setMessage("Continue ?")
.setPositiveButton("Quit",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);
}).setNegativeButton("Retry",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {

}}).show();

Answer 1

您需要附加Activity以启动另一个Context，然后将Builder传递给Intent intent = new Intent(context, MainActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intent.putExtra("EXIT", true); context.startActivity(intent);中使用内容变量的getContext ：

Intent i = new Intent(getContext(), MainActivity.class);
getContext().startActivity(i);

您还可以通过{{1}}方法获取上下文：

{{1}}

Answer 2

将意图写入类似的方法

 public void anotheractivity()
  {
    Intent intent = new Intent(getApplicationContext(), MainActivity.class);
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  intent.putExtra("EXIT", true);
 startActivity(intent);  


}

并从警告框中调用它们，

        new AlertDialog.Builder(this)
   .setTitle("End Option ")
  .setMessage("Continue ?")
  .setPositiveButton("Quit",new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int which) {
     //call the method here
        anotheractivity();
     }).setNegativeButton("Retry",new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog,int which) {

        }}).create().show();

Android AlertDialog使用Intents完成Activity

2 个答案: