TermuxFilePickerProvider: Small improvements

1. Return true from onCreate().
2. Implement getType().

app/build.gradle

@@ -18,8 +18,8 @@ android {
         applicationId "com.termux"
         minSdkVersion 21
         targetSdkVersion 23
-        versionCode 28
-        versionName "0.28"
+        versionCode 29
+        versionName "0.29"
     }
 
     buildTypes {

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -525,6 +525,10 @@ public final class TermuxActivity extends Activity implements ServiceConnection
 		}
 
 		registerReceiver(mBroadcastReceiever, new IntentFilter(RELOAD_STYLE_ACTION));
+
+		// The current terminal session may have changed while being away, force
+		// a refresh of the displayed terminal:
+		mTerminalView.onScreenUpdated();
 	}
 
 	@Override

app/src/main/java/com/termux/app/TermuxInstaller.java

@@ -182,7 +182,7 @@ final class TermuxInstaller {
 		if (arch.startsWith("arm") || arch.equals("aarch64")) {
 			// Handle different arm variants such as armv7l:
 			arch = "arm";
-		} else if (arch.equals("x86_64")) {
+		} else if (arch.startsWith("x86")) { // "x86" on arcwelder, "x86_64" on 64-bit android.
 			arch = "i686";
 		}
 		return new URL("https://termux.net/bootstrap/bootstrap-" + arch + ".zip");

app/src/main/java/com/termux/filepicker/TermuxFilePickerProvider.java

@@ -7,6 +7,7 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.ParcelFileDescriptor;
 import android.support.annotation.NonNull;
+import android.webkit.MimeTypeMap;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -15,7 +16,7 @@ import java.io.FileNotFoundException;
 public class TermuxFilePickerProvider extends ContentProvider {
     @Override
     public boolean onCreate() {
-        return false;
+        return true;
     }
 
     @Override
@@ -25,7 +26,20 @@ public class TermuxFilePickerProvider extends ContentProvider {
 
     @Override
     public String getType(@NonNull Uri uri) {
-        return null;
+		String contentType = null;
+		String path = uri.getPath();
+		int lastDotIndex = path.lastIndexOf('.');
+		String possibleFileExtension = path.substring(lastDotIndex + 1, path.length());
+		if (possibleFileExtension.contains("/")) {
+			// The dot was in the path, so not a file extension.
+		} else {
+			MimeTypeMap mimeTypes = MimeTypeMap.getSingleton();
+			// Lower casing makes it work with e.g. "JPG":
+			contentType = mimeTypes.getMimeTypeFromExtension(possibleFileExtension.toLowerCase());
+		}
+
+		if (contentType == null) contentType = "application/octet-stream";
+		return contentType;
     }
 
     @Override

app/src/main/java/com/termux/view/TerminalView.java

@@ -47,7 +47,7 @@ import java.util.Properties;
 public final class TerminalView extends View {
 
 	/** Log view key and IME events. */
-	private static final boolean LOG_KEY_EVENTS = true;
+	private static final boolean LOG_KEY_EVENTS = false;
 
 	/** The currently displayed terminal session, whose emulator is {@link #mEmulator}. */
 	TerminalSession mTermSession;

app/src/main/res/values/strings.xml

@@ -12,7 +12,7 @@
    <string name="help">Help</string>
 
    <string name="welcome_dialog_title">Welcome to Termux</string>
-   <string name="welcome_dialog_body">Long press anywhere on the terminal for a context menu where Help is available.\n\nExecute \'apt update\' to update the packages list before installing packages.</string>
+   <string name="welcome_dialog_body">Long press and select <i>More…</i> to show a menu where <i>Help</i> is available.\n\nExecute <b>apt update</b> to update the packages list before installing packages.</string>
    <string name="welcome_dialog_dont_show_again_button">Do not show again</string>
 
    <string name="bootstrap_installer_body">Installing…</string>