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Get Context Java Android example


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getContext() getApplicationContext() method Java Android example source






Context myContext_1 = ThisClassName.this; // to open a Dialog
Context myContext_2 = getContext();
Context myContext_3 = this.getContext();
Context myContext_4 = this;
Context myContext_5 = this.getApplicationContext ();


OnClickListener getImageBtnOnClick = new OnClickListener() {
public void onClick(View view) {
Context context = view.getContext();

}
};
// Toast
Toast.makeText(getApplicationContext(), "Context == getApplicationContext "
, Toast.LENGTH_SHORT).show();



// store Context in public class
public class MyActivity extends Activity {
public static Context myCnt = null;
...
protected void onCreate(Bundle icicle) {
...
myCnt = this;
MyStorage.setContext(myCnt);
// or
// MyStorage.setContext(this);

// cntxFromStorage == this
Context cntxFromStorage = MyStorage.getContext();
...
};
};

public class MyStorage
{
private static Context cntStorageContext = null;


public static Context getContext() {
return cntStorageContext;
}

public static void setContext(Context context) {
MyStorage.cntStorageContext = context;
}


};

class DataBaseHelper extends SQLiteOpenHelper {
// get MyActivity context
Context cnt = MyStorage.getContext();

}




397LW NO topic_id




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Use this code for example in some method or function

// public Object getSystemService (String name)
// Return the handle to a system-level service by name.
// The class of the returned object varies by the requested name.
InputMethodManager inputMethodManager = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
//public boolean hideSoftInputFromWindow (IBinder windowToken, int flags)
//EditText myEdit = (EditText)findViewById(R.id.idEditText);
inputMethodManager .hideSoftInputFromWindow(myEdit.getWindowToken(), 0);


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Android Studio hide delete import module | android-studio-hide-delete-import-module


Hide module - open dialog: File > Project Structure Ctrl + Alt + Shift + S
android-studio-hide-module.jpg

Hide module: in opened Dialog select module which will hidden and click on minus (left upper corner)

android-studio-hide-module-from-project-explorer.jpg

If module is hidden, you can permanetly delete module from disk. But if you want using module in future,  copy module into other folder (not into AndroidProjects folder and his subbfolders) and delete module permanetly from project and disc. Right mouse click on module and select from menu Delete.
android-studio-delete-module-from-disc.jpg

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android-studio-import-module.jpg
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First cteate big icon 512x512 px formtat .PGN in graphics editor as Photoshop, Gimp, Piant.NET and save image.
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Eclipse will make all icons from this image for new application very well.

create-custom-icon-eclipse

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382

Convert Activity to Fragment Step by Step | convert-activity-to-fragment-step-by-step


public class Main extends Activity {

private TextView mTextView;
private Activity mAct;
private Intent mIntent;

protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main_layout);
  mTextView = findViewById(R.id.mTextView);
  mAct = getActivity();
  mIntent = getIntent();
 }

}


to:
public class Main extends Fragment{

 private TextView mTextView;
 private FragmentActivity mFrgAct;
 private Intent mIntent;
 private LinearLayout mLinearLayout;
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
          Bundle savedInstanceState) {
          View root = inflater.inflate(R.layout.fragment_main, null);
        return root;
    }

 public void onViewCreated(View view, Bundle savedInstanceState) {
          // you can add listener of elements here
          /*Button mButton = (Button) view.findViewById(R.id.button);
            mButton.setOnClickListener(this); */
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          mLinearLayout = (LinearLayout)view;
 }
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276

Create Image From View Screen Android | create-image-from-view-screen-android



WebView_webview = (WebView)findViewById(R.id.webViewMapa);
_webview.getSettings().setBuiltInZoomControls(true);
_webview.setBackgroundColor(Color.parseColor("#E8EAE8"));
// _webview.loadUrl( ... some your page

Bitmap b = Bitmap.createBitmap(_webview.getWidth()/2, _webview.getHeight(), Bitmap.Config.ARGB_8888);
// you can to draw on bitmap
Canvas c = new Canvas(b);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStrokeWidth(15.f);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
//paint.setShadowLayer(5.f, 0, 5.f, 0xFF000000);
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c.drawLine(70, 0, 150, 350, paint);// draw some line
//Rect oval = new Rect(0, 0, 100, 100);
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// you can show bitmap in other view
((ImageView)findViewById(R.id.imageView1)).setImageBitmap(b);



Editace: 2011-10-15 08:31:19
Počet článků v kategorii: 397
Url:get-context-java-android-example

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