Java 在alertDialog中使用意图
我有以下由if语句触发的警报对话框:Java 在alertDialog中使用意图,java,android,if-statement,android-alertdialog,Java,Android,If Statement,Android Alertdialog,我有以下由if语句触发的警报对话框: if (x < 10) { AlertDialog.Builder builder= new AlertDialog.Builder(parentActivity); builder.setTitle(x.toString()); builder.setMessage(x.toString()); builder.setPositi
if (x < 10) {
AlertDialog.Builder builder= new AlertDialog.Builder(parentActivity);
builder.setTitle(x.toString());
builder.setMessage(x.toString());
builder.setPositiveButton("x", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub//
Intent intent = new Intent(parentActivity.getApplicationContext(),secondActivity.class);
Bundle b = new Bundle();
b.putString("x",x.toString());
intent.putExtras(b);
startActivity(intent);
}});
AlertDialog dialog = builder.create();
dialog.show();
清单看起来像
</activity>
<activity
android:name=".secondActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="uk.ac.ucl.cege.ucestw0.SECONDACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
试一试
在第二个活动中
Intent intent = getIntent();
String x= intent.getStringExtra("x");
及
如果x是一个整数,则通过以下方式将其转换为字符串:
x+”
或string.valueOf(x)
,或string str=integer.toString(x)代码>什么是父活动?任何错误或异常??父活动是一个上下文variable@Raghunandan我把错误加进去了。Thanksx是一个整数值吗?String.valueOf(x)。同时检查链接。不建议使用中的getApplicationContext()。意向意向=新意向(parentActivity.this,secondActivity.class);。getApplicationContext()不在recommended@Shiv好的,谢谢。那么CurrentActivity是我的类名还是我直接键入CurrentActivity?抱歉问了这么愚蠢的问题!hehe ya current activity是您当前工作的类名,如果x是整数,则将其转换为x+“”或String.valueOf(x)或String str=integer.toString(x)@user2076033而不是CurrentActivity.this使用ActivityName.this(活动类的名称)。在你的情况下,我想parentActivity是你的职业的名字
threadid=1: thread exiting with uncaught exception (group=0x40015560)
E/AndroidRuntime(1103): FATAL EXCEPTION: main
E/AndroidRuntime(1103): java.lang.NullPointerException
E/AndroidRuntime(1103): at android.app.Activity.startActivityForResult(Activity.java:2827)
E/AndroidRuntime(1103): at android.app.Activity.startActivity(Activity.java:2933)
E/AndroidRuntime(1103): at my.package.QuizMeLocationListener$1.onClick(mainAcitivity.java:79)
E/AndroidRuntime(1103): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:159)
E/AndroidRuntime(1103): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(1103): at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime(1103): at android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime(1103): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(1103): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(1103): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/AndroidRuntime(1103): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/AndroidRuntime(1103): at dalvik.system.NativeStart.main(Native Method)
Intent intent = new Intent(CurrentActivity.this,secondActivity.class); //CurrentActivity is your current activity name
intent.putExtra("x",x.toString());
startActivity(intent);
Intent intent = getIntent();
String x= intent.getStringExtra("x");