Android主萤幕
作者：互联网
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;
}
@Override
public 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();
}
@Override
protected 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;
}
}
}
@Override
protected 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);
}
@Override
public 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>
标签：viewflipper,launcher,android 来源： https://codeday.me/bug/20191102/1995090.html