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代码片段 (2) [代码] FlingGalleryActivity import 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; 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 FlingGalleryActivity 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.argb(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 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.onCreate(savedInstanceState); mGallery = new FlingGallery(this); mGallery.setPaddingWidth(5); mGallery.setAdapter(new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, mLabelArray) { @Override public View getView(int position, View convertView, ViewGroup parent) { Log.d("111", "count="+position); // if (convertView != null && convertView instanceof GalleryViewItem) // { // GalleryViewItem galleryView = (GalleryViewItem) convertView; // // galleryView.mEdit1.setText(""); // galleryView.mText1.setText(mLabelArray[position]); // galleryView.mText1.setBackgroundColor(mColorArray[position]); // galleryView.mText2.setText(mLabelArray[position]); // galleryView.mText2.setBackgroundColor(mColorArray[position]); // // Log.d("111", "count="+position); // // return galleryView; // // } return new GalleryViewItem(getApplicationContext(), position); } }); LinearLayout layout = new LinearLayout(getApplicationContext()); layout.setOrientation(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 = 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) { 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; private 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, 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(mLabelArray[position]); mText1.setTextSize(30); mText1.setGravity(Gravity.LEFT); mText1.setBackgroundColor(mColorArray[position]); this.addView(mText1, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)); mButton1 = new Button(context); mButton1.setText("<<"); mButton1.setGravity(Gravity.LEFT); mButton1.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { mGallery.movePrevious(); } }); this.addView(mButton1, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)); mButton2 = new Button(context); mButton2.setText(">>"); mButton2.setGravity(Gravity.RIGHT); 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(mLabelArray[position]); mText2.setTextSize(30); mText2.setGravity(Gravity.RIGHT); mText2.setBackgroundColor(mColorArray[position]); this.addView(mText2, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1)); } } } [代码] FlingGallery import android.content.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.Transformation; 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 sure we are not allocating objects (strings, etc.) in loops public 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; 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 = 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 mDecelerateInterpolater; public FlingGallery(Context context) { super(context); mContext = context; mAdapter = null; mViews = new FlingGalleryView[3]; mViews[0] = new FlingGalleryView(0, this); mViews[1] = new FlingGalleryView(1, this); mViews[2] = new FlingGalleryView(2, this); mAnimation = new FlingGalleryAnimation(); mGestureDetector = new GestureDetector(new FlingGestureDetector()); mDecelerateInterpolater = AnimationUtils.loadInterpolator(mContext, android.R.anim.decelerate_interpolator); } public void setPaddingWidth(int viewPaddingWidth) { mViewPaddingWidth = viewPaddingWidth; } public void setAnimationDuration(int animat