运行效果图:
实现原理:标签布局好了以后,标签所在View响应onClick事件。添加另外的标签View,不响应点击事件,用于实现动画效果。在标签的onClick事件中调整移动的起始位置,和滑动标签的状态。
布局文件activity_label.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="40dip" android:background="@android:drawable/title_bar" > <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:orientation="horizontal" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_1" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="图片" /> </RelativeLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_2" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="地图" /> </RelativeLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_3" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="搜索" /> </RelativeLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_4" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="问答" /> </RelativeLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_5" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="新闻" /> </RelativeLayout> <RelativeLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_weight="1" > <TextView android:id="@+id/label_6" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:text="更多" /> </RelativeLayout> </LinearLayout> <TextView android:id="@+id/label_move" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:background="@android:drawable/editbox_background" android:gravity="center" android:text="图片" /> </RelativeLayout> </LinearLayout>
说明:
- 为了让被点击的标签所占区域更大,使用了android:layout_height="fill_parent"设置;
- 使用android:layout_weight="1"控制显示的相对大小;
主要代码:
import android.app.Activity; import android.os.Bundle; import android.view.Display; import android.view.View; import android.view.WindowManager; import android.view.View.OnClickListener; import android.view.animation.TranslateAnimation; import android.widget.TextView; public class LabelActivity extends Activity implements OnClickListener { /** * 标签字符 */ private String[] labelValues = {"图片", "地图", "搜索", "问答", "新闻", "更多"}; /** * 标签数组 */ private TextView[] labelViews = new TextView[6]; /** * 动画标签 */ private TextView labelMove; /** * 标签宽度 */ private int labelWidth; /** * 移动开始位置 */ private int fromX; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_label); setTitle("标签"); // 获得标签引用 labelViews[0] = (TextView) findViewById(R.id.label_1); labelViews[1] = (TextView) findViewById(R.id.label_2); labelViews[2] = (TextView) findViewById(R.id.label_3); labelViews[3] = (TextView) findViewById(R.id.label_4); labelViews[4] = (TextView) findViewById(R.id.label_5); labelViews[5] = (TextView) findViewById(R.id.label_6); labelMove = (TextView) findViewById(R.id.label_move); // 添加点击事件 for (int i = 0, length = labelViews.length; i< length; i++) { labelViews[i].setOnClickListener(this); } // 获得并设置标签宽度 WindowManager windowManager = getWindowManager(); Display display = windowManager.getDefaultDisplay(); labelWidth = display.getWidth() / 6; labelMove.setWidth(labelWidth); } @Override public void onClick(View v) { int index = 0; switch (v.getId()) { case R.id.label_1: index = 0; break; case R.id.label_2: index = 1; break; case R.id.label_3: index = 2; break; case R.id.label_4: index = 3; break; case R.id.label_5: index = 4; break; case R.id.label_6: index = 5; break; default: return; } // 移动View translate(labelMove, fromX, labelWidth * index); // 设置标题 labelMove.setText(labelValues[index]); // 更新fromX,为下次移动做准备 fromX = labelWidth * index; } /** * 将View从(fromX,0)移动到(toX,0) * @param view * @param fromX * @param toX */ public static void translate(View view, int fromX, int toX) { TranslateAnimation translateAnimation = new TranslateAnimation(fromX, toX, 0, 0); translateAnimation.setDuration(200); translateAnimation.setFillAfter(true); view.startAnimation(translateAnimation); } }
说明:
- labelMove:用于移动和标识被选中标签的View,可以通过改变这个View的属性来达到想要的选中效果;
- translate:把View水平方向移动;
- onClick中的switch获得需要的index,然后设置labelMove的属性和下次移动水平的开始位置;