android

问题 In TextInputLayout I want to add TextInputEditText via Custom class Here is the code for custom class I have created : public class CustomTextInputEditText extends TextInputLayout { private TextInputEditText editText; public CustomTextInputEditText(@NonNull Context context) { this(context, null); } public CustomTextInputEditText(@NonNull Context context, @Nullable AttributeSet attrs) { this(context, attrs, R.style.Widget_MaterialComponents_TextInputLayout_OutlinedBox); } public

问题 So, I have 4 activities Activity Activity1 , Activity2 , Activity3 and Activity4 . I start from Activity1 then on some event I start Activity2 then on some event on Activity2 I start Activity3 as a new task as public void onClick(View v) { Intent intent = new Intent(Activity2.this, Activity3.class); intent.setFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK|Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } Here Activity2 launchMode is decalared as singleTask. Then I navigate from Activity3 to

问题 unfortunately I have to support Android 2.3, but I want to use a third party ui widget that has min-sdk 14 (Android 4.0). Is there a way to include the dependency with min-sdk 14? In code I would check Build.SDK_INT to determine whether to use the ui widget with min SDK 14 or a fallback UI widget. 回答1: It is not possible... If you have a dependency it is inside you compilation. inside your apk. You can choose if you want to use this third party lib with if(SDK_INT) but the lib will be

问题 unfortunately I have to support Android 2.3, but I want to use a third party ui widget that has min-sdk 14 (Android 4.0). Is there a way to include the dependency with min-sdk 14? In code I would check Build.SDK_INT to determine whether to use the ui widget with min SDK 14 or a fallback UI widget. 回答1: It is not possible... If you have a dependency it is inside you compilation. inside your apk. You can choose if you want to use this third party lib with if(SDK_INT) but the lib will be

问题 I want to encrypt video on the fly that android camera captures. So I need to tell android MediaRecorder to write it video stream to my CipherOutputStream . The problem is MediaRecorder.setOutputFile() method accepts only FileDescriptor and there is no way to get encrypting file descriptor from CipherOutputStream. So my question is how can I either emulate FileDescriptor to receive data writes and do encryption manually or somehow convince MediaRecorder to stream video into CipherOutputStream

问题 I am trying to open the browser window from my service with a link that opens in the current tab of the browser. when I use Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse("http://www.google.com")); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); context.startActivity(intent); If the browser was opened and in the foreground before my service starts the intent and the browser opens the link in the same window/tab. If the Browser was minimized and the

问题 I want to know if the MD5 digest algorithm is guaranteed to be available in all Android devices before I bluntly ignore the checked exception that MessageDigest.getInstance("MD5") can throw. 回答1: The Android JCE (Java Cryptography Extension) is based off the bouncycastle implementation but stripped down. bouncycastle provides a ton of different MessageDigests which can be found here. There's no guarantee that every Android device supports MD5 but it's extremely common and is likely to be on

问题 After I updated Android Studio, one of my projects cannot be built. The error message is: Error:(20) error: unknown element <library> found. Error:(20) unknown element <library> found. Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details Error:com.android.tools

问题 Well i am trying to implement basic functionality of voice recording , like Record , play/pause , stop i am able to do all of them but the only issue is how can i get notified once the audio gets finished playing. I mean if i play an audio file then once it gets finished playing i want a notification that it is stopped now. so far i have used mPlayer.start() // to start the audio mPlayer.stop(); // to stop the audio mPlayer.pause(); //to pause the audio i am just trying to find out how would

问题 when using ar.toArray(new String[ar.size()]) Android studio 3.2.1 warns about pre-sized array and recommends empty array : There are two styles to convert a collection to an array: either using a pre-sized array (like c.toArray(new String[c.size()])) or using an empty array (like c.toArray(new String[0]). In older Java versions using pre-sized array was recommended, as the reflection call which is necessary to create an array of proper size was quite slow. However since late updates of