Android Develop Tricks-1

Android Develop Tricks Set the size of the Alertdialog:

Alertdialog dialog = builder.settitle ("message list"). Setview (Layout). Create ();d ialog.show ();//Set the size of the window Dialog.getwindow (). SetLayout (300, 200);

Dialog.show (); Be sure to place the Dialog.getwindow (). setlayout (300, 200); the front, otherwise, does not work.

Another implementation:

Windowmanager.layoutparams params = Dialog.getwindow (). GetAttributes ();p arams.width = 300;params.height = 200; Dialog.getwindow (). SetAttributes (params);

In fact, SetLayout is the encapsulation of this method:

        Final Windowmanager.layoutparams attrs = GetAttributes ();        Attrs.width = width;        attrs.height = height;        if (mcallback! = null) {            mcallback.onwindowattributeschanged (attrs);        }

Show view at any location:

Add View via WindowManager:

Mwindowmanager = Getwindowmanager ();          Layoutinflater Inflater = (layoutinflater) getsystemservice (layout_inflater_service);          Mdialogview = inflater.inflate (R.layout.dialogview, null);          Windowmanager.layoutparams params = new Windowmanager.layoutparams ();          Params.height = WindowManager.LayoutParams.WRAP_CONTENT;          Params.width = WindowManager.LayoutParams.WRAP_CONTENT;          Params.y + + +;          Params.x + = -30;          Initdialogcomponents (Mdialogview);          Add dialog Box          mwindowmanager.addview (Mdialogview, params);

General method of touch Movement for any view: same as rewrite ontoucheent

Package Ui;import Android.content.context;import Android.util.attributeset;import android.util.DisplayMetrics; Import Android.util.log;import Android.view.motionevent;import Android.view.windowmanager;import Android.view.animation.alphaanimation;import Android.view.animation.animation;import Android.view.animation.animationset;import Android.view.animation.scaleanimation;import android.widget.Button;/*  * * * @author Chenxiruanhai * * */public class Menubutton extends Button {private Context mcontext;private WindowManager Mwm;int lastx;int lasty;int screenwidth;int screenheight;public Menubutton (context context, AttributeSet Attrs) {super ( context, attrs); this.mcontext = CONTEXT;MWM = (windowmanager) mcontext.getsystemservice (context.window_service);D Isplaymetrics DM = mcontext.getresources (). Getdisplaymetrics (); screenwidth = Dm.widthpixels;screenheight = Dm.heightpixels;} @Overridepublic boolean ontouchevent (Motionevent event) {super.ontouchevent (event); measure (0, 0); switch ( Event.getactIon ()) {Case MotionEvent.ACTION_DOWN:lastX = (int) event.getrawx (); lasty = (int) event.getrawy (); break;case MotionEvent.ACTION_MOVE:int dx = (int) event.getrawx ()-Lastx;int dy = (int) Event.getrawy ()-Lasty;int left = This.getl EFT () + dx;int top = this.gettop () + Dy;int right = This.getright () + Dx;int bottom = This.getbottom () + dy;if (left < 0) {left = 0;right = left + This.getwidth ();} if (right > ScreenWidth) {right = Screenwidth;left = Right-this.getwidth ();} if (Top < 0) {top = 0;bottom = top + this.getheight ();} if (Bottom > screenheight) {bottom = Screenheight;top = Bottom-this.getheight ();} This.layout (left, top, right, bottom), lastx = (int) event.getrawx (); lasty = (int) event.getrawy (); lastx = (int) event.getr AwX (); lasty = (int) event.getrawy (); break;case motionevent.action_up:{animation alphaanimation = new Alphaanimation ( 0.5F,1F); Alphaanimation.setduration (1000); Animation scaleAnimation2 = new Scaleanimation (1.0f,. 5f,1.0f,.5f); Scaleanimation2.setduration(500); Animationset animationset = new Animationset (true); Animationset.addanimation (alphaanimation); Animationset.addanimation (scaleanimation); Animationset.addanimation (ScaleAnimation2); Animationset.setfillafter (TRUE); Animation Currentanima = Getanimation (); if (Null!=currentanima) {currentanima.cancel (); Animationset.reset ();} Startanimation (Animationset);} break;} return true;}}

ImageView Set Property scaletype to Fit_start after removing extra whitespace

Imageview.setscaletype (Imageview.fit_start);        Imageview.setadjustviewbounds (TRUE);

Android Develop Tricks-1