Question

我希望在按下“createAppointment”按钮时启动新活动，但到目前为止，当我单击按钮时，应用程序崩溃。

创建按钮：

<Button
    android:id="@+id/crtApp"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Create Appointment"
    android:layout_gravity="center"/>

createApp.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/createAppointment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginBottom="36sp"
        android:text="Create Appointment"
        android:textSize="34sp" />

    <TextView
        android:id="@+id/titleOfAppointment"
        android:layout_width="318dp"
        android:layout_height="wrap_content"
        android:text="Title"
        android:textSize="24sp" />

    <EditText
        android:id="@+id/titleappointment"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15sp"
        android:layout_marginLeft="10dp"
        android:ems="10" />

    <TextView
        android:id="@+id/timeappointment"
        android:layout_width="318dp"
        android:layout_height="wrap_content"
        android:text="Time"
        android:textSize="24sp" />

    <EditText
        android:id="@+id/timeappointment"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15sp"
        android:layout_marginLeft="10dp"
        android:ems="10" />

    <TextView
        android:id="@+id/detailsappointment"
        android:layout_width="318dp"
        android:layout_height="wrap_content"
        android:text="Details"
        android:textSize="24sp" />
    <EditText
        android:id="@+id/detailsappointment"
        android:layout_width="292dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="65dp"
        android:layout_marginLeft="10dp"
        android:layout_weight="0.07"
         />

     <Button
        android:id="@+id/save_button"
        android:layout_width="105dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="200dp"
        android:layout_weight="0.01" 
        android:text="Save"/>

</LinearLayout>

CreateAppointment.java

package com.examples;

import android.app.Activity;
import android.os.Bundle;

public class CreateAppointment extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.createapp);
    }

}

启动新活动按钮的代码

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.simple_calendar_view);
    Button createAppointment = (Button)findViewById(R.id.crtApp);
    createAppointment.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            // TODO Auto-generated method stub
            startActivity(new Intent("android.intent.action.CREATEAPP"));           
        }
    });
}

LOG CAT

04-25 15:17:13.719: W/dalvikvm(460): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-25 15:17:13.779: E/AndroidRuntime(460): FATAL EXCEPTION: main
04-25 15:17:13.779: E/AndroidRuntime(460): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.CREATEAPP }
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1408)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.app.Activity.startActivityForResult(Activity.java:2817)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.app.Activity.startActivity(Activity.java:2923)
04-25 15:17:13.779: E/AndroidRuntime(460):  at com.examples.SimpleCalendarViewActivity$1.onClick(SimpleCalendarViewActivity.java:60)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.view.View.performClick(View.java:2408)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.view.View$PerformClick.run(View.java:8816)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.os.Handler.handleCallback(Handler.java:587)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.os.Handler.dispatchMessage(Handler.java:92)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.os.Looper.loop(Looper.java:123)
04-25 15:17:13.779: E/AndroidRuntime(460):  at android.app.ActivityThread.main(ActivityThread.java:4627)
04-25 15:17:13.779: E/AndroidRuntime(460):  at java.lang.reflect.Method.invokeNative(Native Method)
04-25 15:17:13.779: E/AndroidRuntime(460):  at java.lang.reflect.Method.invoke(Method.java:521)
04-25 15:17:13.779: E/AndroidRuntime(460):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-25 15:17:13.779: E/AndroidRuntime(460):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-25 15:17:13.779: E/AndroidRuntime(460):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

如果我理解得很好，你想按下按钮开始活动。然后你应该有这样的事情：

createAppointment.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
     Intent intent = new Intent(your_context, CreateAppointment.class);
     startActivity(intent);
     }
 });

希望它有所帮助！（为了更好地理解你的错误日志:)）

Answer 2

检查以确保活动位于AndroidManifest.xml文件中。

Answer 3

startActivity(new Intent(getBaseContext(), CreateAppointment.class));

并且像kailoon所说，“检查以确保活动在AndroidManifest.xml文件中。”

Answer 4

您是否在清单文件中声明了活动？除了旅行>

Intent i = new Intent();
i.setClassName(pkgname, activity name);
startActivity(i);

Answer 5

<Button />需要android:onClick="your method name here"属性

和Java代码看起来应该是这样的

public void methodName(View view)
{
  Intent intent = new Intent(this, ClassName.class);
  startActivity(intent)
}

按下按钮开始新的活动按钮

5 个答案: