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There is only one thread and it is responsible for both running the app code and updating the display. This code loop is referred to as the app's thread of execution. The app runs its code in a loop under the control of the Android Operating Systems (OS). An app is notified of an event and responds to it if required, often running the code that has been written. Something happens on the device (the screen is touched, a key is pressed, a call comes in, etc.) and Android raises an event. When setText("New Text") is run the text is not updated immediately. Tv.setText("New Text") App Code Runs on a Single Thread and Responds to Events TextView tv = (TextView) findViewById(R.id.textView1) For those new to programming the above is equivalent to the following two lines but saves having to declare the TextView object. When changing the TextView text the following code, or similar, becomes very familiar to all Android developers: ((TextView) findViewById(R.id.textView1)).setText("New Text") įor the above Java effectively creates an anonymous object and casts it as a TextView object.
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CANNOT UPDATE ANDROID STUDIO HOW TO
When entering code in Studio add import statements when prompted by pressing Alt-Enter.) How to Change the Text on a TextView or EditText The example code can be changed to meet your own requirements. (To use the code in this tutorial it is assumed that Android Studio is installed, a basic app can be created and run, and the code in this article can be correctly copied into Android Studio. The example source code includes a work around to help you out. is not working as intended, or you UI is sluggish, then read on. So if you are trying to find out why setText() on EditText, TextView, Button, etc. This tutorial is also useful in helping to understand why the User Interface (UI) in your Android app might not be as responsive as expected. Why this happens is explained in this article.
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The text not updating also applies to other Views as well, such as the EditText and Button. Why does changing the text for a TextView using the setText method not work sometimes? New Android developers sometimes fail to understand why changing the text does not appear to work. Why Your TextView or Button Text Is Not Updating