大家好,这是我的第一篇文章,所以对我好一点！
我想开发一个应用程序,您可以像在主屏幕上一样浏览7个左右的屏幕.
我已经看到了一些关于此的帖子,但是我似乎无法使其正常工作,也似乎也无法对其添加评论(我敢肯定这是我的菜鸟)
因此,我需要一个有效的项目,以便可以对其进行查看和分解,并使用与我相关的位.
对此很感兴趣,但我无法使其正常工作.我使用Eclipse,而SDK是其他所有人使用的吗？
Developing an Android Homescreen
当我实现它时,我需要告诉应用程序如何启动,因为它安装了它,但说没有活动.
希望你能帮忙
Ť
我的Main.Java中有什么
package com.matthIEu.launcher;import androID.app.Activity;import androID.content.Intent;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.vIEw.VIEw.OnClickListener;import androID.Widget.button;import androID.Widget.VIEwFlipper;public class main extends Activity { /** Called when the activity is first created. */ @OverrIDe public voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.main); button onebutton = (button)findVIEwByID(R.ID.soundsone); onebutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs1button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button twobutton = (button)findVIEwByID(R.ID.soundstwo); twobutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs2button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button threebutton = (button)findVIEwByID(R.ID.soundsthree); threebutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs3button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button fourbutton = (button)findVIEwByID(R.ID.soundsfour); fourbutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs4button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button fivebutton = (button)findVIEwByID(R.ID.soundsfive); fivebutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs5button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button sixbutton = (button)findVIEwByID(R.ID.soundssix); sixbutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs6button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button sevenbutton = (button)findVIEwByID(R.ID.soundsseven); sevenbutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs7button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); button eightbutton = (button)findVIEwByID(R.ID.soundseight); eightbutton.setonClickListener(new OnClickListener() { public voID onClick(VIEw v) { Intent i = new Intent(main.this, serIEs8button.class); startActivity(i); overrIDePendingTransition(R.anim.push_up_in, R.anim.push_up_out); } }); }}然后Dragablespace.java
package com.matthIEu.launcher;import androID.content.Context;import androID.app.Activity;import androID.util.Log;import androID.content.res.TypedArray;import androID.util.AttributeSet;import androID.vIEw.MotionEvent;import androID.vIEw.VeLocityTracker;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.vIEw.VIEwConfiguration;import androID.Widget.Scroller;public class DragableSpace extends VIEwGroup { private Scroller mScroller; private VeLocityTracker mVeLocityTracker; private int mScrollX = 0; private int mCurrentScreen = 0; private float mLastMotionX; private static final String LOG_TAG = "DragableSpace"; private static final int SNAP_VELociTY = 1000; private final static int touch_STATE_REST = 0; private final static int touch_STATE_SCRolliNG = 1; private int mtouchState = touch_STATE_REST; private int mtouchSlop = 0; public DragableSpace(Context context) { super(context); mScroller = new Scroller(context); mtouchSlop = VIEwConfiguration.get(getContext()).getScaledtouchSlop(); this.setLayoutParams(new VIEwGroup.LayoutParams( VIEwGroup.LayoutParams.WRAP_CONTENT, VIEwGroup.LayoutParams.FILL_PARENT)); } public DragableSpace(Context context, AttributeSet attrs) { super(context, attrs); mScroller = new Scroller(context); mtouchSlop = VIEwConfiguration.get(getContext()).getScaledtouchSlop(); this.setLayoutParams(new VIEwGroup.LayoutParams( VIEwGroup.LayoutParams.WRAP_CONTENT , VIEwGroup.LayoutParams.FILL_PARENT)); TypedArray a=getContext().obtainStyledAttributes(attrs,R.styleable.DragableSpace); mCurrentScreen = a.getInteger(R.styleable.DragableSpace_default_screen, 0); } @OverrIDe public boolean onIntercepttouchEvent(MotionEvent ev) { /* * This method JUST determines whether we want to intercept the motion. * If we return true, ontouchEvent will be called and we do the actual * scrolling there. */ /* * Shortcut the most recurring case: the user is in the dragging state * and he is moving his finger. We want to intercept this motion. */ final int action = ev.getAction(); if ((action == MotionEvent.ACTION_MOVE) && (mtouchState != touch_STATE_REST)) { return true; } final float x = ev.getX(); switch (action) { case MotionEvent.ACTION_MOVE: /* * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check * whether the user has moved far enough from his original down touch. */ /* * Locally do absolute value. mLastMotionX is set to the y value * of the down event. */ final int xDiff = (int) Math.abs(x - mLastMotionX); boolean xMoved = xDiff > mtouchSlop; if (xMoved) { // Scroll if the user moved far enough along the X axis mtouchState = touch_STATE_SCRolliNG; } break; case MotionEvent.ACTION_DOWN: // Remember location of down touch mLastMotionX = x; /* * If being flinged and user touches the screen, initiate drag; * otherwise don't. mScroller.isFinished should be false when * being flinged. */ mtouchState = mScroller.isFinished() ? touch_STATE_REST : touch_STATE_SCRolliNG; break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: // Release the drag mtouchState = touch_STATE_REST; break; } /* * The only time we want to intercept motion events is if we are in the * drag mode. */ return mtouchState != touch_STATE_REST;}@OverrIDepublic boolean ontouchEvent(MotionEvent event) { if (mVeLocityTracker == null) { mVeLocityTracker = VeLocityTracker.obtain(); } mVeLocityTracker.addMovement(event); final int action = event.getAction(); final float x = event.getX(); switch (action) { case MotionEvent.ACTION_DOWN: Log.i(LOG_TAG, "event : down"); /* * If being flinged and user touches, stop the fling. isFinished * will be false if being flinged. */ if (!mScroller.isFinished()) { mScroller.abortAnimation(); } // Remember where the motion event started mLastMotionX = x; break; case MotionEvent.ACTION_MOVE: // Log.i(LOG_TAG,"event : move"); // if (mtouchState == touch_STATE_SCRolliNG) { // Scroll to follow the motion event final int deltaX = (int) (mLastMotionX - x); mLastMotionX = x; //Log.i(LOG_TAG, "event : move, deltaX " + deltaX + ", mScrollX " + mScrollX); if (deltaX < 0) { if (mScrollX > 0) { scrollBy(Math.max(-mScrollX, deltaX), 0); } } else if (deltaX > 0) { final int availabletoScroll = getChildAt(getChildCount() - 1) .getRight() - mScrollX - getWIDth(); if (availabletoScroll > 0) { scrollBy(Math.min(availabletoScroll, deltaX), 0); } } // } break; case MotionEvent.ACTION_UP: Log.i(LOG_TAG, "event : up"); // if (mtouchState == touch_STATE_SCRolliNG) { final VeLocityTracker veLocityTracker = mVeLocityTracker; veLocityTracker.computeCurrentVeLocity(1000); int veLocityX = (int) veLocityTracker.getXVeLocity(); if (veLocityX > SNAP_VELociTY && mCurrentScreen > 0) { // Fling hard enough to move left snapToScreen(mCurrentScreen - 1); } else if (veLocityX < -SNAP_VELociTY && mCurrentScreen < getChildCount() - 1) { // Fling hard enough to move right snapToScreen(mCurrentScreen + 1); } else { snapToDestination(); } if (mVeLocityTracker != null) { mVeLocityTracker.recycle(); mVeLocityTracker = null; } // } mtouchState = touch_STATE_REST; break; case MotionEvent.ACTION_CANCEL: Log.i(LOG_TAG, "event : cancel"); mtouchState = touch_STATE_REST; } mScrollX = this.getScrollX(); return true;}private voID snapToDestination() { final int screenWIDth = getWIDth(); final int whichScreen = (mScrollX + (screenWIDth / 2)) / screenWIDth; Log.i(LOG_TAG, "from des"); snapToScreen(whichScreen);}public voID snapToScreen(int whichScreen) { Log.i(LOG_TAG, "snap To Screen " + whichScreen); mCurrentScreen = whichScreen; final int newX = whichScreen * getWIDth(); final int delta = newX - mScrollX; mScroller.startScroll(mScrollX, 0, delta, 0, Math.abs(delta) * 2); invalIDate();}public voID setToScreen(int whichScreen) { Log.i(LOG_TAG, "set To Screen " + whichScreen); mCurrentScreen = whichScreen; final int newX = whichScreen * getWIDth(); mScroller.startScroll(newX, 0, 0, 0, 10); invalIDate();}@OverrIDeprotected voID onLayout(boolean changed, int l, int t, int r, int b) { int childleft = 0; final int count = getChildCount(); for (int i = 0; i < count; i++) { final VIEw child = getChildAt(i); if (child.getVisibility() != VIEw.GONE) { final int chilDWIDth = child.getMeasureDWIDth(); child.layout(childleft, 0, childleft + chilDWIDth, child .getMeasuredHeight()); childleft += chilDWIDth; } }}@OverrIDeprotected voID onMeasure(int wIDthMeasureSpec, int heightmeasureSpec) { super.onMeasure(wIDthMeasureSpec, heightmeasureSpec); final int wIDth = MeasureSpec.getSize(wIDthMeasureSpec); final int wIDthMode = MeasureSpec.getMode(wIDthMeasureSpec); if (wIDthMode != MeasureSpec.EXACTLY) { throw new IllegalStateException("error mode."); } final int heightmode = MeasureSpec.getMode(heightmeasureSpec); if (heightmode != MeasureSpec.EXACTLY) { throw new IllegalStateException("error mode."); } // The children are given the same wIDth and height as the workspace final int count = getChildCount(); for (int i = 0; i < count; i++) { getChildAt(i).measure(wIDthMeasureSpec, heightmeasureSpec); } Log.i(LOG_TAG, "moving to screen "+mCurrentScreen); scrollTo(mCurrentScreen * wIDth, 0); } @OverrIDepublic voID computeScroll() { if (mScroller.computeScrollOffset()) { mScrollX = mScroller.getCurrX(); scrollTo(mScrollX, 0); postInvalIDate(); }}}然后我的main.xml布局
<?xml version="1.0" enCoding="utf-8"?><com.matthIEu.launcher.DragableSpace xmlns:app="http://schemas.androID.com/apk/res/com.matthIEu.launcher" xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:ID="@+ID/space" androID:layout_wIDth="fill_parent" androID:layout_height="fill_parent" app:default_screen="1"> <include androID:ID="@+ID/left" layout="@layout/left_screen" /> <include androID:ID="@+ID/center" layout="@layout/initial_screen" /> <include androID:ID="@+ID/right" layout="@layout/right_screen" /></com.matthIEu.launcher.DragableSpace>我还有3个其他的布局文件,分别称为initial,left和right(_screen)
解决方法:
您需要编辑清单,以便应用程序知道首次启动时要使用哪个活动.
<application> <activity androID:name=".YourActivityname" androID:label="Your Label"> <intent-filter> <action androID:name="androID.intent.action.MAIN"/> <category androID:name="androID.intent.category.LAUNCHER"/> </intent-filter> </activity> </application>以上是内存溢出为你收集整理的Android主萤幕全部内容，希望文章能够帮你解决Android主萤幕所遇到的程序开发问题。
如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。
欢迎分享，转载请注明来源：内存溢出
微信扫一扫
支付宝扫一扫
评论列表（0条）