使用AlertDialog按钮开始新活动

I am trying to use an alertdialog to allow the user to press the ok button and open a new activity. Below is my code:

我正在尝试使用alertdialog来允许用户按下确定按钮并打开一个新活动。以下是我的代码:

My first activity

我的第一个活动

 AlertDialog.Builder dialog=    new AlertDialog.Builder(context);
                dialog.setTitle("Welcome");
                dialog.setMessage("Please click ok");
                dialog.setPositiveButton("OK", new    DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent("com.thewildOnz.myResult");
                    startActivity(intent);
                    }
                });
                dialog.show();

the new activity

新的活动

public class myResult extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.result);

Manifest:

</activity>
           <activity
        android:name=".myResult"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.thewildOnz.myResult" />

            <category android:name="android.intent.category.DEFUALT" />
        </intent-filter>
    </activity>

However I get the error:

但是我收到错误:

java.lang.NullPointerException

What am I missing?

我错过了什么?

2 个解决方案

#1

You need to call .create() on your AlertDialog.

您需要在AlertDialog上调用.create()。

AlertDialog.Builder builder= new AlertDialog.Builder(context);
builder.setTitle("Welcome");
builder.setMessage("Please click ok");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() 
{
    @Override
    public void onClick(DialogInterface dialog, int which) 
    {
        Intent intent = new Intent("com.thewildOnz.myResult");
        startActivity(intent);
    }
});
AlertDialog dialog = builder.create();
dialog.show();

You also may be using new Intent("") incorrectly. Unless you have "com.thewildOnz.myResult" defined as an action, this will fail.

您也可能错误地使用了新的Intent(“”)。除非你将“com.thewildOnz.myResult”定义为一个动作,否则这将失败。

You should be using this:

你应该使用这个:

Intent intent = new Intent(this, com.thewildOnz.myResult.class);

#2

Maybe you got a typo it's DEFAULT :

也许你得到一个错字它是DEFAULT:

        <category android:name="android.intent.category.DEFUALT" />

#1