Open Close Hide Project in Eclipse - save memory
Close one project:¨
-right click on project
- select Close project
Close more projects:
- right click on project
- select Close Unrelated Projects
Hide closed projects:
- package explorer
- view menu
- select Closed projects
-right click on project
- select Close project
Close more projects:
- right click on project
- select Close Unrelated Projects
Hide closed projects:
- package explorer
- view menu
- select Closed projects



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Issue: After after renaming package this problem occurred "R cannot be resolved to a variable".
Solution: Try Clean your project Project » Clean » Clean projects selected below » select your project and click OK.
Try to delete the invalid code and type it again:
Solution: Try Clean your project Project » Clean » Clean projects selected below » select your project and click OK.
Try to delete the invalid code and type it again:
LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // delete R.id.layout
LinearLayout layout = (LinearLayout) findViewById();
LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // re-write this code R.id.layout
Draw the trajectory of shot.
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
}
private static void makePath(Path p) {
p.moveTo(10, 0);
p.cubicTo(100, -50, 200, 150, 300, 0);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.CYAN);
Paint p = new Paint();
// smooths
p.setAntiAlias(true);
p.setColor(Color.RED);
p.setStyle(Paint.Style.STROKE);
p.setStrokeWidth(5);
// opacity
//p.setAlpha(0x80);
p.setColor(Color.BLACK);
Path mPath = new Path();
makePath(mPath);
canvas.drawPath(mPath, p); //(rectF, 90, 45, true, p);
}
}
}
Log.e println needs a message error.
E/AndroidRuntime(330): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{b.paint/b.paint.MainActivity}: java.lang.NullPointerException: println needs a message
Try this code:
E/AndroidRuntime(330): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{b.paint/b.paint.MainActivity}: java.lang.NullPointerException: println needs a message
Try this code:
// Error
String s = null;
Log.e("bla", s); // !!! error Log.e println needs a message error.
// OK
String s = null;
Log.e("bla", s+""); // OK
While cycle Java basic example with array of strings.
MainClass.java
MainClass.java
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = { "Hello", "people", "hello", "world!" };
int i = 0;
while ( i < arrayOfString.length ){
System.out.println(arrayOfString[i]);
i++;
}
}
}
static boolean mbThemeLight = false;
@Override
public void onCreate(Bundle savedInstanceState) {
if(mbThemeLight)
setTheme(android.R.style.Theme_Light);
super.onCreate(savedInstanceState);
// bla bla bla..........
}
private void switchTheme(){
mbThemeLight = true;
this.recreate();
}
Editace: 2014-02-15 20:22:03
Počet článků v kategorii: 396
Url:close-hide-project-in-eclipse-save-memory