android-activity

问题 My app shows some content (video,pdf,img, etc ) and within every content I can start another content. What I want is to have only "one back history". For example, if my activity history is like this: VideoActivityIns1->PdfActivityIns1->VideoActivityIns2 I need to go back from VideoActivityIns2 to PdfActivityIns1, but one step back is should be MainActivity of my app. How can I do this? Any help would be appreciated 回答1: Each activity has activity lifecycle methods you can override to achieve

问题 My app shows some content (video,pdf,img, etc ) and within every content I can start another content. What I want is to have only "one back history". For example, if my activity history is like this: VideoActivityIns1->PdfActivityIns1->VideoActivityIns2 I need to go back from VideoActivityIns2 to PdfActivityIns1, but one step back is should be MainActivity of my app. How can I do this? Any help would be appreciated 回答1: Each activity has activity lifecycle methods you can override to achieve

问题 Following my privious qustion that you can see here: How to create custom listview for android with margins between 2 elements? I have made some progress due to the help I recived here. So my state right now is: http://i.stack.imgur.com/yK5to.jpg pressing on the blue part of one of the tasks pops the following color plate activity: http://i.stack.imgur.com/UWmIg.jpg all the 5 colors here are buttons, what i need to do is to check what color was pressed and then change the background drawing

问题 Following my privious qustion that you can see here: How to create custom listview for android with margins between 2 elements? I have made some progress due to the help I recived here. So my state right now is: http://i.stack.imgur.com/yK5to.jpg pressing on the blue part of one of the tasks pops the following color plate activity: http://i.stack.imgur.com/UWmIg.jpg all the 5 colors here are buttons, what i need to do is to check what color was pressed and then change the background drawing

问题 For a complete beginner like me, can anyone tell me how to just create sample demo application using "https://github.com/umano/AndroidSlidingUpPanel" in Android Studio version "0.8.6". I have followed these mentioned steps in order to include the Android Sliding panel library 1) Download the latest stable release from the following location"https://github.com/umano/AndroidSlidingUpPanel/releases" 2)extract the zip folder From the you tube video "https://www.youtube.com/watch?v=1MyBO9z7ojk" 3

问题 I have fixed my screen orientation in an activity with android:screenOrientation="portrait" Still, I want to find the angle at which the user is currently holding the screen, i.e, 0, 90 or 270. Accordingly I have to perform some actions. getWindowManager().getDefaultDisplay() .getRotation() The above code will always return 0 since I have fixed the orientation of the screen. Can someone please suggest how do I determine the screen orientation in this situation. 回答1: Your activity should

问题 I have an activity that launches another one using startActivityForResult. This step is ok. Then the second activity has a map and when a button is clicked the geopoint coordinates are passed to a bundle that is used on first activity to fullfil an EditText. The function onActivityResult is runned until the end and then the program crashes and appears a message with "Source not found" on screen. This is the function on mapActivity: public void ConfirmLoc(View v){ double lat = loc

问题 I cannot figure out what is causing this Thread error. Here is my code. I commented out almost all the code and it still won't work: package com.dd.relay; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.ListActivity; import android.content.Context; import android.os.Bundle; import android.view.Menu; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget

问题 I have been developing a project in eclipse for an android app. An error which i frequently get is that of- activity class does not exist. But when i just save the manifest file once again the error vanishes and the program runs correctly. Why then do i get the same error again and again. ? Console error: [2011-11-18 15:08:38 - link] Starting activity acb.abc.LinkActivity on device emulator-5554 [2011-11-18 15:08:40 - link] ActivityManager: Starting: Intent { act=android.intent.action.MAIN

问题 I have been developing a project in eclipse for an android app. An error which i frequently get is that of- activity class does not exist. But when i just save the manifest file once again the error vanishes and the program runs correctly. Why then do i get the same error again and again. ? Console error: [2011-11-18 15:08:38 - link] Starting activity acb.abc.LinkActivity on device emulator-5554 [2011-11-18 15:08:40 - link] ActivityManager: Starting: Intent { act=android.intent.action.MAIN