Custom Toast in Android.

Customizing Toasts

The standard Toast message window is often sufficient, but in many situations you’ll want to cus- tomize its appearance and screen position. 

You can modify a Toast by setting its display position and assigning it alternative Views or layouts.

Let’s Make a Toast
It shows how to align a Toast to the bottom of the screen using the setGravity method. 

Aligning Toast text
 

Context context = this; 

String msg = “To the bride and groom!”; 

int duration = Toast.LENGTH_SHORT; 

Toast toast = Toast.makeText(context, msg, duration); 

int offsetX = 0; 

int offsetY = 0;
 

toast.setGravity(Gravity.BOTTOM, offsetX, offsetY); 

toast.show();

When a text message just isn’t going to get the job done, you can specify a custom View or layout to use a more complex, or more visual, display. 

Using setView on a Toast object, you can specify any View (including a layout) to display using the Toast mechanism. 

For example, assigns a layout, containing the CompassView Widget  along with a TextView, to be dis- played as a Toast.

Using Views to customize a Toast
 

Context context = getApplicationContext(); 

String msg = “Cheers!”;

int duration = Toast.LENGTH_LONG; 

Toast toast = Toast.makeText(context, msg, duration); 

toast.setGravity(Gravity.TOP, 0, 0);
 

LinearLayout ll = new LinearLayout(context); 

ll.setOrientation(LinearLayout.VERTICAL);
 

TextView myTextView = new TextView(context); 

CompassView cv = new CompassView(context);
myTextView.setText(msg);
 

int lHeight = LinearLayout.LayoutParams.FILL_PARENT; 

int lWidth = LinearLayout.LayoutParams.WRAP_CONTENT;
 

ll.addView(cv, new LinearLayout.LayoutParams(lHeight, lWidth)); 

ll.addView(myTextView, new LinearLayout.LayoutParams(lHeight, lWidth));
ll.setPadding(40, 50, 0, 50);
 

toast.setView(ll); 

toast.show();

The resulting Toast will appear.

Using Toasts in Worker Threads
 

As GUI components, Toasts must be created and shown on the GUI thread; otherwise, you risk throwing a cross-thread exception.A Handler is used to ensure that the Toast is opened on the GUI thread. 

Opening a Toast on the GUI thread
 

Handler handler = new Handler();
private void mainProcessing() 

{  

Thread thread = new Thread(null, doBackgroundThreadProcessing,                            ”Background”);  

thread.start(); }
 

private Runnable doBackgroundThreadProcessing = new Runnable() 

{  

public void run() 

{    

backgroundThreadProcessing();  

} 

};

private void backgroundThreadProcessing() 

{  

handler.post(doUpdateGUI); }
 

// Runnable that executes the update GUI method. 

private Runnable doUpdateGUI = new Runnable() 

{  

public void run() 

{    

Context context = getApplicationContext();    

String msg = “To open mobile development!”;    

int duration = Toast.LENGTH_SHORT;    

Toast.makeText(context, msg, duration).show();  

} 

};