仿腾讯头部切换按钮优化版

仿QQ头部banner切换按钮组件

public class SwitchView extends LinearLayout implements OnClickListener {

private static final int FLAG_MOVE_TRUE = 1; // 向左滑动标识
private static final int FLAG_MOVE_FALSE = 2; // 向右滑动标识

private static final int HANDLE_LAYOUT_CURSOR = 100; // 处理调用开关的layout方法

private Context context; // 上下文对象
private RelativeLayout sv_container; // SwitchView的外层Layout
private ImageView iv_switch_cursor; // 开关邮标的ImageView
private TextView switch_text_true; // true的文字信息控件
private TextView switch_text_false; // false的文字信息控件

private boolean isChecked = true; // 是否已开
private boolean checkedChange = false; // isChecked是否有改变
private OnCheckedChangeListener onCheckedChangeListener; // 用于监听isChecked是否有改变

private boolean isNight = false;

private int margin = 1; // 游标离边缘位置(这个值视图片而定, 主要是为了图片能显示正确)
private int bg_left; // 背景左
private int bg_right; // 背景右
private int cursor_left; // 游标左部
private int cursor_top; // 游标顶部
private int cursor_right; // 游标右部
private int cursor_bottom; // 游标底部

private Animation animation; // 移动动画
private int currentFlag = FLAG_MOVE_TRUE; // 当前移动方向flag

private RelativeLayout relativeLayout;
public SwitchView(Context context) {
super(context);
this.context = context;
initView();
}

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public SwitchView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
this.context = context;
initView();
}

public SwitchView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
this.context = context;
initView();
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
// 获取所需要的值
bg_left = sv_container.getLeft();
bg_right = sv_container.getRight();
cursor_left = iv_switch_cursor.getLeft();
cursor_top = iv_switch_cursor.getTop();
cursor_right = iv_switch_cursor.getRight();
cursor_bottom = iv_switch_cursor.getBottom();
}

private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case HANDLE_LAYOUT_CURSOR:
iv_switch_cursor.layout(cursor_left, cursor_top, cursor_right, cursor_bottom);
break;
}
}
};

public void onClick(View v) {
// 控件点击时触发改变checked值
if(v == this) {
changeChecked(!isChecked);
}
}

/**
* 初始化控件
*/
private void initView() {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.switchview_layout, this);
view.setOnClickListener(this);
sv_container = (RelativeLayout) view.findViewById(R.id.switch_layout);
switch_text_true = (TextView) view.findViewById(R.id.switch_text_true);
switch_text_false = (TextView) view.findViewById(R.id.switch_text_false);
changeTextColor();
iv_switch_cursor = (ImageView) view.findViewById(R.id.iv_switch_cursor);
iv_switch_cursor.setClickable(false);
iv_switch_cursor.setOnTouchListener(new OnTouchListener() {
int lastX; // 最后的X坐标

public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
lastX = (int) event.getRawX();

cursor_left = v.getLeft();
cursor_top = v.getTop();
cursor_right = v.getRight();
cursor_bottom = v.getBottom();
break;
case MotionEvent.ACTION_MOVE:
int dx = (int) event.getRawX() - lastX;

cursor_left = v.getLeft() + dx;
cursor_right = v.getRight() + dx;

// 超出边界处理
if(cursor_left <= bg_left + margin) {
cursor_left = bg_left + margin;
cursor_right = cursor_left + v.getWidth();
}
if(cursor_right >= bg_right - margin) {
cursor_right = bg_right - margin;
cursor_left = cursor_right - v.getWidth();
}
v.layout(cursor_left, cursor_top, cursor_right, cursor_bottom);

lastX = (int) event.getRawX();
break;
case MotionEvent.ACTION_UP:
calculateIscheck();
break;
}
return true;
}
});
}

/**
* 计算处于true或是false区域, 并做改变处理
*/
private void calculateIscheck() {
float center = (float) ((bg_right - bg_left) / 2.0);
float cursor_center = (float) ((cursor_right - cursor_left) / 2.0);
if(cursor_left + cursor_center <= center) {
changeChecked(true);
} else {
changeChecked(false);
}
}

/**
* 改变checked, 根据checked移动游标
* @param isChecked
*/
private void changeChecked(boolean isChecked) {
if(this.isChecked != isChecked) {
checkedChange = true;
} else {
checkedChange = false;
}
if(isChecked) {
currentFlag = FLAG_MOVE_TRUE;
} else {
currentFlag = FLAG_MOVE_FALSE;
}
cursorMove();
}

/**
* 游标移动
*/
private void cursorMove() {
// 这里说明一点, 动画本可设置animation.setFillAfter(true)
// 令动画进行完后停在最后位置. 但这里使用这样方式的话.
// 再次拖动图片会出现异常(具体原因我没找到)
// 所以最后只能使用onAnimationEnd回调方式再layout游标
animation = null;
final int toX;
if(currentFlag == FLAG_MOVE_TRUE) {
toX = cursor_left - bg_left - margin;
animation = new TranslateAnimation(0, -toX, 0, 0);
} else {
toX = bg_right - margin - cursor_right;
animation = new TranslateAnimation(0, toX, 0, 0);
}
animation.setDuration(100);
animation.setInterpolator(new LinearInterpolator());
animation.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation animation) {

}
public void onAnimationRepeat(Animation animation) {

}
public void onAnimationEnd(Animation animation) {
// 计算动画完成后游标应在的位置
if(currentFlag == FLAG_MOVE_TRUE) {
cursor_left -= toX;
cursor_right = cursor_left + iv_switch_cursor.getWidth();
} else {
cursor_right = bg_right - margin;
cursor_left = cursor_right - iv_switch_cursor.getWidth();
}
// 这里不能马上layout游标正确位置, 否则会有一点点闪屏
// 为了美观, 这里迟了一点点调用layout方法, 便不会闪屏
mHandler.sendEmptyMessageDelayed(HANDLE_LAYOUT_CURSOR, 5);
// 这里是根据是不是改变了isChecked值进行一些操作
if(checkedChange) {
isChecked = !isChecked;
if(onCheckedChangeListener != null) {
onCheckedChangeListener.onCheckedChanged(isChecked);
}
changeTextColor();
}
}
});
iv_switch_cursor.startAnimation(animation);
}

/**
* 改变字体显示颜色
*/
private void changeTextColor() {
if(isChecked) {
if(isNight){
switch_text_true.setTextColor(Color.parseColor("#A8A8A8"));
switch_text_false.setTextColor(Color.parseColor("#535353"));
}else{
switch_text_true.setTextColor(Color.BLACK);
switch_text_false.setTextColor(Color.GRAY);
}
} else {
if(isNight){
switch_text_true.setTextColor(Color.parseColor("#535353"));
switch_text_false.setTextColor(Color.parseColor("#A8A8A8"));
}else{
switch_text_true.setTextColor(Color.GRAY);
switch_text_false.setTextColor(Color.BLACK);
}

}
}

/**
* layout游标
*/
private void layoutCursor() {
if(isChecked) {
cursor_left = bg_left + margin;
cursor_right = bg_left + margin + iv_switch_cursor.getWidth();
} else {
cursor_left = bg_right - margin - iv_switch_cursor.getWidth();
cursor_right = bg_right - margin;
}
iv_switch_cursor.layout(cursor_left, cursor_top, cursor_right, cursor_bottom);
changeTextColor();
}

/**
* isChecked值改变监听器
*/
public interface OnCheckedChangeListener {
void onCheckedChanged(boolean isChecked);
}

public boolean isChecked() {
return isChecked;
}

public void setChecked(boolean isChecked) {
if(this.isChecked != isChecked) {
this.isChecked = isChecked;
if(onCheckedChangeListener != null) {
onCheckedChangeListener.onCheckedChanged(isChecked);
}
layoutCursor();
}
}

public void setOnCheckedChangeListener(
OnCheckedChangeListener onCheckedChangeListener) {
this.onCheckedChangeListener = onCheckedChangeListener;
}

public void changeMode(boolean isNight){
this.isNight = isNight;
if(isNight){
sv_container.setBackgroundResource(R.drawable.bbs_posts_switch_bg_night);
iv_switch_cursor.setBackgroundResource(R.drawable.bbs_posts_switch_content_bg_night);
}else{
sv_container.setBackgroundResource(R.drawable.bbs_posts_switch_bg);
iv_switch_cursor.setBackgroundResource(R.drawable.bbs_posts_switch_content_bg);
}
changeTextColor();
}

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/switch_layout"
android:layout_width="170dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/bbs_posts_switch_bg">
<ImageView
android:id="@+id/iv_switch_cursor"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="@drawable/bbs_posts_switch_content_bg"
android:contentDescription="@null"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_centerVertical="true">
<TextView
android:id="@+id/switch_text_true"
android:layout_width="85dp"
android:layout_height="wrap_content"
android:textSize="14sp"
android:gravity="center"
android:textColor="#ff000000"
android:text="分组" />
<TextView
android:id="@+id/switch_text_false"
android:layout_width="85dp"
android:layout_height="wrap_content"
android:textSize="14sp"
android:gravity="center"
android:textColor="#ff000000"
android:text="全部" />
</LinearLayout>
</RelativeLayout>

以上是布局文件。

用到的资源文件：

app_top_banner_layout_bg2.png //背景



bbs_posts_switch_bg_night.png //夜晚模式



bbs_posts_switch_bg.png //



bbs_posts_switch_content_bg_night.png



bbs_posts_switch_content_bg.png