android实现uc和墨迹天气那样的左右拖动效果.docx

1、android实现uc和墨迹天气那样的左右拖动效果代码 FlingGalleryActivityimport android.app.Activity;import android.os.Bundle;import android.content.Context;import android.graphics.Color;import android.util.Log;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup

2、;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.LinearLayout;import android.widget.TableLayout;import android.widget.TextView;public class FlingGalleryActivit

3、y extends Activity private final int color_red = Color.argb(100, 200, 0, 0); private final int color_green = Color.argb(100, 0, 200, 0); private final int color_blue = Color.argb(100, 0, 0, 200); private final int color_yellow = Color.argb(100, 200, 200, 0); private final int color_purple = Color.ar

4、gb(100, 200, 0, 200); private final String mLabelArray = View1, View2, View3, View4, View5; private final int mColorArray = color_red, color_green, color_blue, color_yellow, color_purple; private FlingGallery mGallery; private CheckBox mCheckBox; / Note: The following handler is critical to correct

5、function of / the FlingGallery class. This enables the FlingGallery class to / detect when the motion event has ended by finger being lifted Override public boolean onTouchEvent(MotionEvent event) return mGallery.onGalleryTouchEvent(event); public void onCreate(Bundle savedInstanceState) super.onCre

6、ate(savedInstanceState); mGallery = new FlingGallery(this); mGallery.setPaddingWidth(5); mGallery.setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, mLabelArray) Override public View getView(int position, View convertView, ViewGroup parent) Log.d(111, count=+po

7、sition);/ if (convertView != null & convertView instanceof GalleryViewItem)/ / GalleryViewItem galleryView = (GalleryViewItem) convertView;/ galleryView.mEdit1.setText();/ galleryView.mText1.setText(mLabelArrayposition);/ galleryView.mText1.setBackgroundColor(mColorArrayposition);/ galleryView.mText

8、2.setText(mLabelArrayposition);/ galleryView.mText2.setBackgroundColor(mColorArrayposition);/ / Log.d(111, count=+position);/ / return galleryView;/ / return new GalleryViewItem(getApplicationContext(), position); ); LinearLayout layout = new LinearLayout(getApplicationContext(); layout.setOrientati

9、on(LinearLayout.VERTICAL); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT); layoutParams.setMargins(10, 10, 10, 10); layoutParams.weight = 1.0f; layout.addView(mGallery, layoutParams); mCheckBox =

10、 new CheckBox(getApplicationContext(); mCheckBox.setText(Gallery is Circular); mCheckBox.setText(Gallery is Circular); mCheckBox.setPadding(50, 10, 0, 10); mCheckBox.setTextSize(30); mCheckBox.setChecked(true); mCheckBox.setOnClickListener(new OnClickListener() Override public void onClick(View view

11、) mGallery.setIsGalleryCircular(mCheckBox.isChecked(); ); layout.addView(mCheckBox, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); setContentView(layout); private class GalleryViewItem extends TableLayout private EditText mEdit1; priva

12、te TextView mText1; private TextView mText2; private Button mButton1; private Button mButton2; public GalleryViewItem(Context context, int position) super(context); this.setOrientation(LinearLayout.VERTICAL); this.setLayoutParams(new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,

13、 LinearLayout.LayoutParams.MATCH_PARENT); mEdit1 = new EditText(context); this.addView(mEdit1, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); mText1 = new TextView(context); mText1.setText(mLabelArrayposition); mText1.setTextSize(30);

14、mText1.setGravity(Gravity.LEFT); mText1.setBackgroundColor(mColorArrayposition); this.addView(mText1, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); mButton1 = new Button(context); mButton1.setText(); mButton2.setGravity(Gravity.RIGHT)

15、; mButton2.setOnClickListener(new OnClickListener() Override public void onClick(View view) mGallery.moveNext(); ); this.addView(mButton2, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); mText2 = new TextView(context); mText2.setText(mL

16、abelArrayposition); mText2.setTextSize(30); mText2.setGravity(Gravity.RIGHT); mText2.setBackgroundColor(mColorArrayposition); this.addView(mText2, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1); 代码 FlingGalleryimport android.content.

17、Context;import android.view.GestureDetector;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.animation.Interpolator;import android.view.animation.Transformati

18、on;import android.widget.Adapter;import android.widget.FrameLayout;import android.widget.LinearLayout;/ TODO:/ 1. In order to improve performance Cache screen bitmap and use for animation/ 2. Establish superfluous memory allocations and delay or replace with reused objects/ Probably need to make sur

19、e we are not allocating objects (strings, etc.) in loopspublic class FlingGallery extends FrameLayout / Constants private final int swipe_min_distance = 120; private final int swipe_max_off_path = 250; private final int swipe_threshold_veloicty = 400; / Properties private int mViewPaddingWidth = 0;

20、private int mAnimationDuration = 250; private float mSnapBorderRatio = 0.5f; private boolean mIsGalleryCircular = true; / Members private int mGalleryWidth = 0; private boolean mIsTouched = false; private boolean mIsDragging = false; private float mCurrentOffset = 0.0f; private long mScrollTimestamp

21、 = 0; private int mFlingDirection = 0; private int mCurrentPosition = 0; private int mCurrentViewNumber = 0; private Context mContext; private Adapter mAdapter; private FlingGalleryView mViews; private FlingGalleryAnimation mAnimation; private GestureDetector mGestureDetector; private Interpolator m

22、DecelerateInterpolater; public FlingGallery(Context context) super(context); mContext = context; mAdapter = null; mViews = new FlingGalleryView3; mViews0 = new FlingGalleryView(0, this); mViews1 = new FlingGalleryView(1, this); mViews2 = new FlingGalleryView(2, this); mAnimation = new FlingGalleryAn

23、imation(); mGestureDetector = new GestureDetector(new FlingGestureDetector(); mDecelerateInterpolater = AnimationUtils.loadInterpolator(mContext, android.R.anim.decelerate_interpolator); public void setPaddingWidth(int viewPaddingWidth) mViewPaddingWidth = viewPaddingWidth; public void setAnimationD

24、uration(int animationDuration) mAnimationDuration = animationDuration; public void setSnapBorderRatio(float snapBorderRatio) mSnapBorderRatio = snapBorderRatio; public void setIsGalleryCircular(boolean isGalleryCircular) if (mIsGalleryCircular != isGalleryCircular) mIsGalleryCircular = isGalleryCirc

25、ular; if (mCurrentPosition = getFirstPosition() / We need to reload the view immediately to the left to change it to circular view or blank mViewsgetPrevViewNumber(mCurrentViewNumber).recycleView(getPrevPosition(mCurrentPosition); if (mCurrentPosition = getLastPosition() / We need to reload the view

26、 immediately to the right to change it to circular view or blank mViewsgetNextViewNumber(mCurrentViewNumber).recycleView(getNextPosition(mCurrentPosition); public int getGalleryCount() return (mAdapter = null) ? 0 : mAdapter.getCount(); public int getFirstPosition() return 0; public int getLastPosit

27、ion() return (getGalleryCount() = 0) ? 0 : getGalleryCount() - 1; private int getPrevPosition(int relativePosition) int prevPosition = relativePosition - 1; if (prevPosition getLastPosition() nextPosition = getLastPosition() + 1; if (mIsGalleryCircular = true) nextPosition = getFirstPosition(); return nextPosition; private int getPrevViewNumber(int relativeViewNumber) return (relativeViewNumber = 0) ? 2 : relativeViewNumber - 1; private int getNextViewNumber(int relativeViewNumber) return