Picture Viewer in Android

In this case, use Eclipse to develop the Android2.1 version of the picture Viewer.

1) First, open Eclipse, create a new Android2.1 version of the project SHOWTU, open the Strings.xml in the Res/values directory, and replace the code with code:

Path: Showtu/res/valus/string.xml

<?xml version= "1.0" encoding= "Utf-8"?><resources> <string    name= "Hello" >hello world, showtuactivity!</string>    <string name= "app_name" >showtu</string><string name= "pre" > Previous vice </string><string name= "after" > Next </string></resources>

2) Open Main.xml under Res/layout file, there are two button controls and one ImageView control in the layout file. The code is as follows:

Path: Showtu/res/layout/main.xml

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Fill_parent "android:layout_height=" fill_parent "android:orientation=" vertical "&G t;<!--Horizontal linear layout--><linearlayout android:id= "@+id/linearlayout01" android:orientation= "Horizontal" Android: Layout_width= "wrap_content" android:layout_gravity= "center" android:layout_height= "Wrap_content" > <!--button Controls- -><button android:text= "@string/pre" android:id= "@+id/button01" android:textcolor= "#000000" Android:layout_ Width= "Wrap_content" android:layout_height= "wrap_content" ></button><button android:text= "@string/ After "android:id=" @+id/button02 "android:textcolor=" #000000 "android:layout_width=" Wrap_content "Android:layout_ height= "Wrap_content" ></button></linearlayout><imageview android:id= "@+id/ImageView01" Android : layout_width= "wrap_content" android:layout_height= "Wrap_content" Android:layout_gravity= "center" > </ImageView> <textview android:layout_width= "Fill_parent" android:layout_height = "Wrap_content" android:text= "@string/hello"/> </LinearLayout>

3) Next, the main activity file Showtuactivity.java, the code is as follows:

Path: Src/com.tu.ui/showtuactivity.java

Package Com.tu.ui;import Android.app.activity;import Android.os.bundle;import android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.imageview;import Android.widget.toast;public class Showtuactivity extends activity {/** Called when the activity is first created. */im Ageview iv;//declaration ImageView Control int count;//counter int drawableids[]={//picture ID array R.drawable.pic0,r.drawable.pic1, R.drawable.pic2,r.drawable.pic3,r.drawable.pic4,r.drawable.pic5,r.drawable.pic6,r.drawable.pic7,    R.DRAWABLE.PIC8,R.DRAWABLE.PIC9};        @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.main);//Set Layout iv= (ImageView) Findviewbyid (R.ID.IMAGEVIEW01);//Get ImageView references Iv.setima Geresource (R.DRAWABLE.PIC0);//Set image button pre_btn= (button) Findviewbyid (r.id.button01);//Get a reference to the previous button PRE_BTN.S Etonclicklistener (//Add listener New Onclicklistener () {@Overridepublic void OnClick (View v) {if (count>0) {Iv.setimageresource (Drawableids[--count]);//Set Image}else{toast.maketext (        Showtuactivity.this, "This is the first picture", Toast.length_short). Show ();}}        }        ); Button after_btn= (button) Findviewbyid (R.ID.BUTTON02);//Gets the reference of the Next button After_btn.setonclicklistener (//Add listener new O Nclicklistener () {@Overridepublic void OnClick (View v) {if (count<drawableids.length-1) {Iv.setimageresource (Drawa        Bleids[++count]);//Set Image}else{toast.maketext (Showtuactivity.this, "This is the last picture", Toast.length_short). Show ();}}    }        ); }}

The effect is as follows:

Figure (1)

Figure (2)