將一個Bitmap 的內容存到file中[java]//create a file to write bitmap data File f = File(context.getCacheDir(), filename); f.createNewFile(); //Convert bitmap to byte array Bitmap bitmap = your
新寫了一小段,發現預設class沒有錯,建立的class沒有錯,兩個介面也沒有報錯之前編程, android.content.ActivityNotFoundException: Unable to find explicit activity class {life.xuexi.dierci/life.xuexi.dierci.rgb}; have you declared this activity in your
Android Interface Definition Language (AIDL)IN THIS DOCUMENTDefining an AIDL InterfaceCreate the .aidl fileImplement the interfaceExpose the interface to clientsPassing Objects over IPCCalling an IPC MethodSEE ALSOBound ServicesAIDL (Android
Saving data to a database is ideal for repeating or structured data, such as contact information. This class assumes that you are familiar with SQL databases in general and helps you get started with SQLite databases on Android. The APIs you'll
After setting up your application to work with LocationManager, you can begin to obtain location updates.Set Up the Location ListenerThe LocationManager class exposes a number of methods for applications to receive location updates. In its simplest
As shown in previous lessons, location updates are received in the form of latitude and longitude coordinates. While this format is useful for calculating distance or displaying a pushpin on a map, the decimal numbers make no sense to most end users.
The most fundamental way to reduce your downloads is to download only what you need. In terms of data, that means implementing REST APIs that allow you to specify query criteria that limit the returned data by using parameters such as the time of