How can I make flashing text in bash?
199
Solution 1
We can apply something like this code in bash:
#!/bin/bash
DATA[0]=" _/ _/ _/ _/ "
DATA[1]=" _/_/_/_/_/ _/_/_/ _/_/_/ _/_/_/ _/_/_/ "
DATA[2]=" _/ _/ _/ _/ _/ _/ _/_/ _/ _/"
DATA[3]="_/_/_/_/_/ _/ _/ _/ _/ _/_/ _/ _/ "
DATA[4]=" _/ _/ _/_/_/ _/_/_/ _/_/_/ _/ _/ "
# virtual coordinate system is X*Y ${#DATA} * 5
REAL_OFFSET_X=0
REAL_OFFSET_Y=0
draw_char() {
V_COORD_X=$1
V_COORD_Y=$2
tput cup $((REAL_OFFSET_Y + V_COORD_Y)) $((REAL_OFFSET_X + V_COORD_X))
printf %c ${DATA[V_COORD_Y]:V_COORD_X:1}
}
trap 'exit 1' INT TERM
trap 'tput setaf 9; tput cvvis; clear' EXIT
tput civis
clear
while :; do
for ((c=1; c <= 7; c++)); do
tput setaf $c
for ((x=0; x<${#DATA[0]}; x++)); do
for ((y=0; y<=4; y++)); do
draw_char $x $y
done
done
done
done
Source http://wiki.bash-hackers.org/scripting/terminalcodes
Solution 2
It's called blink mode.
If your terminal supports it, syntax is
echo -e "Normal \e[5mBlink"
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Author by
user3358980
Updated on September 18, 2022Comments
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user3358980 almost 2 years
The emulator does not respond to this code.
It gives the error as "Unfortunatey, Act has stopped ". I tried the same code with just one field as student name and it worked well but with two fields as student name and location its not responding. Pls do help me out.
MainActivity.java
package com.act; import java.util.List; import android.app.ListActivity; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.EditText; public class MainActivity extends ListActivity { private StudentOperations studentDBoperation; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); studentDBoperation = new StudentOperations(this); studentDBoperation.open(); List values = studentDBoperation.getAllStudents(); // Use the SimpleCursorAdapter to show the // elements in a ListView ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, values); setListAdapter(adapter); } public void addUser(View view) { ArrayAdapter adapter = (ArrayAdapter) getListAdapter(); EditText text = (EditText) findViewById(R.id.editText1); EditText text2 = (EditText) findViewById(R.id.editText2); Student stud = studentDBoperation.addStudent(text.getText().toString(),text2.getText().toString()); adapter.add(stud); } public void deleteFirstUser(View view) { ArrayAdapter adapter = (ArrayAdapter) getListAdapter(); Student stud = null; if (getListAdapter().getCount() > 0) { stud = (Student) getListAdapter().getItem(0); studentDBoperation.deleteStudent(stud); adapter.remove(stud); } } @Override protected void onResume() { studentDBoperation.open(); super.onResume(); } @Override protected void onPause() { studentDBoperation.close(); super.onPause(); } }
DataBaseWrapper.java
package com.act; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DataBaseWrapper extends SQLiteOpenHelper { public static final String STUD = "Stud"; public static final String STUDENT_ID = "_id"; public static final String STUDENT_NAME = "_name"; public static final String STUDENT_LOC = "_loc"; private static final String DATABASE_NAME = "Students.db"; private static final int DATABASE_VERSION = 1; // creation SQLite statement private static final String DATABASE_CREATE = "create table " + STUD + "(" + STUDENT_ID + " integer primary key autoincrement, " + STUDENT_NAME + " text not null," + STUDENT_LOC + "text not null );"; public DataBaseWrapper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // you should do some logging in here // .. db.execSQL("DROP TABLE IF EXISTS " + STUD); onCreate(db); } }
Student.java
package com.act; public class Student { private int id; private String name; private String loc; public long getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public String getLoc() { return this.loc; } public void setLoc(String loc) { this.loc = loc; } @Override public String toString() { return name; } }
StudentOperations.java
package com.act; import java.util.ArrayList; import java.util.List; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; public class StudentOperations { // Database fields private DataBaseWrapper dbHelper; private String[] STUDENT_TABLE_COLUMNS = { DataBaseWrapper.STUDENT_ID, DataBaseWrapper.STUDENT_NAME,DataBaseWrapper.STUDENT_LOC }; private SQLiteDatabase database; public StudentOperations(Context context) { dbHelper = new DataBaseWrapper(context); } public void open() throws SQLException { database = dbHelper.getWritableDatabase(); } public void close() { dbHelper.close(); } public Student addStudent(String name, String loc) { ContentValues values = new ContentValues(); values.put(DataBaseWrapper.STUDENT_NAME, name); values.put(DataBaseWrapper.STUDENT_LOC,loc); long studId = database.insert(DataBaseWrapper.STUD, null, values); // now that the student is created return it ... Cursor cursor = database.query(DataBaseWrapper.STUD, STUDENT_TABLE_COLUMNS, DataBaseWrapper.STUDENT_ID + " = " + studId, null, null, null, null); cursor.moveToFirst(); Student newComment = parseStudent(cursor); cursor.close(); return newComment; } public void deleteStudent(Student comment) { long id = comment.getId(); System.out.println("Comment deleted with id: " + id); database.delete(DataBaseWrapper.STUD, DataBaseWrapper.STUDENT_ID + " = " + id, null); } public List getAllStudents() { List students = new ArrayList(); Cursor cursor = database.query(DataBaseWrapper.STUD, STUDENT_TABLE_COLUMNS, null, null, null, null, null); cursor.moveToFirst(); while (!cursor.isAfterLast()) { Student student = parseStudent(cursor); students.add(student); cursor.moveToNext(); } cursor.close(); return students; } private Student parseStudent(Cursor cursor) { Student student = new Student(); student.setId((cursor.getInt(0))); student.setName(cursor.getString(1)); student.setLoc(cursor.getString(2)); return student; } }
XML code activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="vertical" > <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:ems="10" > <requestFocus /> </EditText> <Button android:id="@+id/addBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/editText1" android:onClick="addUser" android:text="Add New" /> <Button android:id="@+id/deleteBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/addBtn" android:layout_below="@+id/editText1" android:onClick="deleteFirstUser" android:text="Delete First" /> <ListView android:id="@android:id/list" android:layout_width="match_parent" android:layout_height="212dp" android:layout_alignParentLeft="true" android:layout_below="@+id/deleteBtn" > </ListView> <EditText android:id="@+id/editText2" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
LOGCAT:
02-27 05:13:53.349: D/dalvikvm(1057): GC_FOR_ALLOC freed 52K, 6% free 2878K/3036K, paused 35ms, total 37ms 02-27 05:13:53.389: D/dalvikvm(1057): GC_FOR_ALLOC freed 4K, 6% free 2972K/3136K, paused 26ms, total 26ms 02-27 05:13:53.399: I/dalvikvm-heap(1057): Grow heap (frag case) to 4.074MB for 1127536-byte allocation 02-27 05:13:53.509: D/dalvikvm(1057): GC_FOR_ALLOC freed <1K, 4% free 4073K/4240K, paused 108ms, total 108ms 02-27 05:13:53.650: E/SQLiteLog(1057): (1) near ")": syntax error 02-27 05:13:53.650: D/AndroidRuntime(1057): Shutting down VM 02-27 05:13:53.650: W/dalvikvm(1057): threadid=1: thread exiting with uncaught exception (group=0x414c4700) 02-27 05:13:53.670: E/AndroidRuntime(1057): FATAL EXCEPTION: main 02-27 05:13:53.670: E/AndroidRuntime(1057): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.act/com.act.MainActivity}: android.database.sqlite.SQLiteException: near ")": syntax error (code 1): , while compiling: create table Stud(_id integer primary key autoincrement, _name text not null,); 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread.access$600(ActivityThread.java:141) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.os.Handler.dispatchMessage(Handler.java:99) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.os.Looper.loop(Looper.java:137) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread.main(ActivityThread.java:5103) 02-27 05:13:53.670: E/AndroidRuntime(1057): at java.lang.reflect.Method.invokeNative(Native Method) 02-27 05:13:53.670: E/AndroidRuntime(1057): at java.lang.reflect.Method.invoke(Method.java:525) 02-27 05:13:53.670: E/AndroidRuntime(1057): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 02-27 05:13:53.670: E/AndroidRuntime(1057): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 02-27 05:13:53.670: E/AndroidRuntime(1057): at dalvik.system.NativeStart.main(Native Method) 02-27 05:13:53.670: E/AndroidRuntime(1057): Caused by: android.database.sqlite.SQLiteException: near ")": syntax error (code 1): , while compiling: create table Stud(_id integer primary key autoincrement, _name text not null,); 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603) 02-27 05:13:53.670: E/AndroidRuntime(1057): at com.act.DataBaseWrapper.onCreate(DataBaseWrapper.java:26) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 02-27 05:13:53.670: E/AndroidRuntime(1057): at com.act.StudentOperations.open(StudentOperations.java:19) 02-27 05:13:53.670: E/AndroidRuntime(1057): at com.act.MainActivity.onCreate(MainActivity.java:19) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.Activity.performCreate(Activity.java:5133) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 02-27 05:13:53.670: E/AndroidRuntime(1057): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 02-27 05:13:53.670: E/AndroidRuntime(1057):
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InnocentKiller over 10 yearstry my below solution and let me know whether it is working or not.
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don_crissti almost 9 yearsBlink doesn't work in terminal emulators afaik...
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anuruddhika over 10 yearsIt's include "," end of the query. i thinks it is syntax error.
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DroidDev over 10 yearsDon't you think
round bracket
andsemicolon
should be insideinverted commas
after"text not null"
? You have left out the ending ofsql statement
.