Android – Using TouchDelegate
Android – Using TouchDelegate<div class="postText"><div id="cnblogs_post_body"> TouchDelegates in Android allow to increase the touch area of a View, e.g. Button. This is very useful if you want to make it easier for the user to touch your button.
Here is a small example for the usage of a touch delegate. The layout has the ID root and contains a button with the ID delegated_button.
<div class="cnblogs_code">kage de.vogella.android.touchdelegate; import android.app.Activity;import android.graphics.Rect;import android.os.Bundle;import android.view.TouchDelegate;import android.view.View;import android.widget.Button; public class MainActivity extends Activity { private Button mButton; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mButton = (Button) findViewById(R.id.delegated_button); View parent = findViewById(R.id.root); parent.post(new Runnable() { public void run() { // Post in the parent's message queue to make sure the parent // lays out its children before we call getHitRect() Rect delegateArea = new Rect(); Button delegate = mButton; delegate.getHitRect(delegateArea); delegateArea.top -= 600; delegateArea.bottom += 600; delegateArea.left -= 600; delegateArea.right += 600; TouchDelegate expandedArea = new TouchDelegate(delegateArea, delegate); // give the delegate to an ancestor of the view we're // delegating the // area to if (View.class.isInstance(delegate.getParent())) { ((View) delegate.getParent()) .setTouchDelegate(expandedArea); } }; }); }
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