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();
}
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Další témata ....(Topics)
Fill the entire canvas with the specified color.
@Override
public void onDraw(Canvas canvas) {
canvas.drawColor(Color.GREEN);
}
The method onClick(DialogInterface, int) of type new DialogInterface.OnClickListener(){} must override a superclass method.
Try this:
Right click on project
Select Properties
In open dialogue select Java compiler
Set Enable project specific settings
Set Compiler compliance level to 1.6
Try this:
Right click on project
Select Properties
In open dialogue select Java compiler
Set Enable project specific settings
Set Compiler compliance level to 1.6


boolean fc(boolean b) {
return b;
}// end fc
boolean bA = true;
boolean bB = true;
boolean bC = bA || bB; // true
bA = true;
bB = false;
bC = bA || bB; // true
bA = false;
bB = true;
bC = bA || bB; // true
bA = false;
bB = false;
bC = bA || bB; // false
if(!fc(bB||bA))
System.out.println("false"); // false
else
System.out.println("true");
PNG, GIF, BMP, JPG
// //www.apache.org/licenses/LICENSE-2.0
// 1.) Bitmap from stream
InputStream is = context.getResources().openRawResource(R.drawable.my_image);
mBitmap = BitmapFactory.decodeStream(is);
// 2.)
Bitmap ball = BitmapFactory.decodeResource(getResources(), R.drawable.ball);
int dstWidth =120;
int dstHeight = 120;
mBitmap = Bitmap.createScaledBitmap(ball, dstWidth, dstHeight, true);
// 3.)
Bitmap mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
Bitmap mBitmap;
Canvas mCanvas;
Paint mBitmapPaint;
mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
// 4.)
Bitmap mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);
Canvas mCanvas.setBitmap(mBitmap);
mCanvas.drawColor(0xFFFFFFFF);
// image from res/drawable
int resID = getResources().getIdentifier("my_image",
"drawable", getPackageName());
// view
int resID = getResources().getIdentifier("my_resource",
"id", getPackageName());
// string
int resID = getResources().getIdentifier("my_string",
"string", getPackageName());
Editace: 2011-10-15 08:31:19
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Url:get-context-java-android-example
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