模拟js的首页动态推荐页面 Gallery 自动播放 无限循环 指示器显示 点击事件

//指示器代码
package com.su.testrcmd;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
 
public class FlowIndicator extends View {
	private int count;
	private float space, radius;
	private int point_normal_color, point_seleted_color;
 
	// 选中
	private int seleted = 0;
 
	// background seleted normal
 
	public FlowIndicator(Context context, AttributeSet attrs) {
		super(context, attrs);
		TypedArray a = context.obtainStyledAttributes(attrs,
				R.styleable.FlowIndicator);
 
		count = a.getInteger(R.styleable.FlowIndicator_count, 4);
		space = a.getDimension(R.styleable.FlowIndicator_space, 9);
		radius = a.getDimension(R.styleable.FlowIndicator_point_radius, 9);
 
		point_normal_color = a.getColor(
				R.styleable.FlowIndicator_point_normal_color, 0x000000);
		point_seleted_color = a.getColor(
				R.styleable.FlowIndicator_point_seleted_color, 0xffff07);
 
		int sum = attrs.getAttributeCount();
		
			String str = "";
			for (int i = 0; i < sum; i++) {
				String name = attrs.getAttributeName(i);
				String value = attrs.getAttributeValue(i);
				str += "attr_name :" + name + ": " + value + "\n";
			}
			Log.i("attribute", str);
	
		a.recycle();
	}
 
	public void setSeletion(int index) {
		this.seleted = index;
		invalidate();
	}
 
	public void setCount(int count) {
		this.count = count;
		invalidate();
	}
 
	public void next() {
		if (seleted < count - 1)
			seleted++;
		else
			seleted = 0;
		invalidate();
	}
 
	public void previous() {
		if (seleted > 0)
			seleted--;
		else
			seleted = count - 1;
		invalidate();
	}
 
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		Paint paint = new Paint();
		paint.setAntiAlias(true);
 
		float width = (getWidth() - ((radius * 2 * count) + (space * (count - 1)))) / 2.f;
 
		for (int i = 0; i < count; i++) {
			if (i == seleted)
				paint.setColor(point_seleted_color);
			else
				paint.setColor(point_normal_color);
			canvas.drawCircle(width + getPaddingLeft() + radius + i
					* (space + radius + radius), getHeight() / 2, radius, paint);
 
		}
	}
 
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		setMeasuredDimension(measureWidth(widthMeasureSpec),
				measureHeight(heightMeasureSpec));
	}
 
	private int measureWidth(int measureSpec) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);
 
		if (specMode == MeasureSpec.EXACTLY) {
			result = specSize;
		} else {
			result = (int) (getPaddingLeft() + getPaddingRight()
					+ (count * 2 * radius) + (count - 1) * radius + 1);
			if (specMode == MeasureSpec.AT_MOST) {
				result = Math.min(result, specSize);
			}
		}
		return result;
	}
 
	private int measureHeight(int measureSpec) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);
 
		if (specMode == MeasureSpec.EXACTLY) {
			result = specSize;
		} else {
			result = (int) (2 * radius + getPaddingTop() + getPaddingBottom() + 1);
			if (specMode == MeasureSpec.AT_MOST) {
				result = Math.min(result, specSize);
			}
		}
		return result;
	}
 
}

package com.su.testrcmd;
//gallery的适配器
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class GalleryAdapter extends BaseAdapter {
	Context mContext;
	int[] res = new int[] { R.drawable.t1, R.drawable.t2, R.drawable.t3 };

	public GalleryAdapter(Context cnt) {
		this.mContext = cnt;
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return Integer.MAX_VALUE;
	}

	public int getRealCount() {
		// TODO Auto-generated method stub
		return res.length;
	}

	@Override
	public Object getItem(int arg0) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public long getItemId(int arg0) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public View getView(int arg0, View arg1, ViewGroup arg2) {
		// TODO Auto-generated method stub
		if (arg1 == null) {
			arg1 = LayoutInflater.from(mContext).inflate(R.layout.gallery_item,
					null);
		}
		ImageView img = (ImageView) arg1.findViewById(R.id.home_img);
		img.setImageResource(res[arg0 % res.length]);
		return arg1;
	}
}

package com.su.testrcmd;
//主界面
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

public class TestRcmdActivity extends Activity {
	static final int SCROLL_ACTION = 0;
	private Gallery mGallery;
	private com.su.testrcmd.FlowIndicator mMyView;
	private com.su.testrcmd.GalleryAdapter mGalleryAdapter;
	private Timer mTimer;
	private int realcount;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		mTimer = new Timer();
		mTimer.scheduleAtFixedRate(new MyTask(), 0, 5000);
		mGallery = (Gallery) findViewById(R.id.home_gallery);
		mMyView = (FlowIndicator) findViewById(R.id.myView);
		mGalleryAdapter = new GalleryAdapter(this);
		realcount = mGalleryAdapter.getRealCount();
		mMyView.setCount(realcount);
		mGallery.setAdapter(mGalleryAdapter);
		mGallery.setSelection(200);
		mGallery.setOnItemSelectedListener(new OnItemSelectedListener() {

			@Override
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
				// TODO Auto-generated method stub
				mMyView.setSeletion(arg2 % realcount);
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
				// TODO Auto-generated method stub

			}
		});
		mGallery.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				Toast.makeText(TestRcmdActivity.this, "测试" + arg2 % realcount,
						10).show();

			}
		});
	}

	private class MyTask extends TimerTask {
		@Override
		public void run() {
			mHandler.sendEmptyMessage(SCROLL_ACTION);
		}
	}

	Handler mHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			super.handleMessage(msg);
			switch (msg.what) {
			case SCROLL_ACTION:
				MotionEvent e1 = MotionEvent.obtain(SystemClock.uptimeMillis(),
						SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN,
						89.333336f, 265.33334f, 0);
				MotionEvent e2 = MotionEvent.obtain(SystemClock.uptimeMillis(),
						SystemClock.uptimeMillis(), MotionEvent.ACTION_UP,
						300.0f, 238.00003f, 0);

				mGallery.onFling(e1, e2, -1300, 0);

				break;

			default:
				break;
			}
		}
	};
}

主界面xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res/com.su.testrcmd"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Gallery
        android:id="@+id/home_gallery"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:spacing="5dip" />
 
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#65000000"
        android:orientation="vertical" >
 
        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginBottom="5dip"
            android:layout_marginTop="5dip"
            android:text="推荐图片页面测试"
            android:textColor="#ffffff"
            android:textSize="18dip" />
 
        <com.su.testrcmd.FlowIndicator
            android:id="@+id/myView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dip"
            app:count="4"
            android:gravity="center"
            android:paddingRight="20dip"
            app:point_normal_color="#45000000"
            app:point_radius="3dip"
            app:point_seleted_color="#ffffff"
            app:point_size="5dip"
            app:space="10dip" />
    </LinearLayout>
 
</FrameLayout>

item.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <ImageView
        android:id="@+id/home_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true" android:src="@drawable/t1"/>
 
</FrameLayout>
 

指示器的风格文件

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="FlowIndicator">
        <attr name="count" format="integer" />
        <attr name="space" format="dimension" />
        <attr name="point_size" format="dimension" />
        <attr name="point_seleted_color" format="color|reference" />
        <attr name="point_normal_color" format="color|reference" />
        <attr name="point_radius" format="dimension" />
    </declare-styleable>

</resources>