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Android编程实现可滑动的开关效果(附demo源码下载)

2019-12-12 06:37:42
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本文实例讲述了Android编程实现可滑动的开关效果。分享给大家供大家参考,具体如下:

闲着没事,把之前写的一个Demo放上来分享下。就是一个开关,实现可滑动和动画效果。不是图片切换。

好了,先上图:

完整实例代码点击此处本站下载

直接把自定义的这个View代码放上来,有注释应该很好理解:
首先是布局:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/sv_container"  android:layout_width="230dip"  android:layout_height="38dip"  android:background="@drawable/usage_list_dark" >  <ImageView    android:id="@+id/iv_switch_cursor"    android:layout_width="120dip"    android:layout_height="36dip"    android:layout_centerVertical="true"    android:layout_marginLeft="0.5dip"    android:layout_marginRight="0.5dip"    android:background="@drawable/usage_list_green" />  <LinearLayout    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center" >    <TextView      android:id="@+id/switch_text_true"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="1"      android:gravity="center"      android:text="开" />    <TextView      android:id="@+id/switch_text_false"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="1"      android:gravity="center"      android:text="关" />  </LinearLayout></RelativeLayout>

接着是这个View的代码,继承自LinearLayout :

package com.lxb.switchdemo;import android.content.Context;import android.graphics.Color;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.LinearInterpolator;import android.view.animation.TranslateAnimation;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.TextView;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 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  public SwitchView(Context context) {    super(context);    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.switch_view, this);    view.setOnClickListener(this);    sv_container = (RelativeLayout) view.findViewById(R.id.sv_container);    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) {      switch_text_true.setTextColor(Color.WHITE);      switch_text_false.setTextColor(Color.GRAY);    } else {      switch_text_true.setTextColor(Color.GRAY);      switch_text_false.setTextColor(Color.WHITE);    }  }  /**   * 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);  }  /**   * 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;  }}

最后是Activity使用这个View:

package com.lxb.switchdemo;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;import com.lxb.switchdemo.SwitchView.OnCheckedChangeListener;public class Switch_demoActivity extends Activity implements OnClickListener {  private LinearLayout layout;  private TextView tv_showcheck;  private SwitchView sv;  private Button btn_set_true;  private Button btn_set_false;  private Button btn_getstate;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    layout = (LinearLayout) findViewById(R.id.layout);    tv_showcheck = (TextView) findViewById(R.id.tv_showcheck);    sv = new SwitchView(this);    tv_showcheck.setText("当前状态: " + getState(sv.isChecked()));    sv.setOnCheckedChangeListener(new OnCheckedChangeListener() {      public void onCheckedChanged(boolean isChecked) {        tv_showcheck.setText("当前状态: " + getState(isChecked));      }    });    layout.addView(sv);    btn_set_true = (Button) findViewById(R.id.btn_set_true);    btn_set_false = (Button) findViewById(R.id.btn_set_false);    btn_getstate = (Button) findViewById(R.id.btn_getstate);    btn_set_true.setOnClickListener(this);    btn_set_false.setOnClickListener(this);    btn_getstate.setOnClickListener(this);  }  public void onClick(View v) {    switch(v.getId()) {    case R.id.btn_set_true:      sv.setChecked(true);      break;    case R.id.btn_set_false:      sv.setChecked(false);      break;    case R.id.btn_getstate:      Toast.makeText(Switch_demoActivity.this,          sv.isChecked() + "", Toast.LENGTH_SHORT).show();      break;    }  }  private String getState(boolean state) {    if(state) {      return "开";    }    return "关";  }}

实现起来还是很简单的,主要还是坐标什么的需要计算与调整。

当然可能还会有一些BUG存在,有需要的可以下下来自行修改,也可以和我讨论。

更多关于Android相关内容感兴趣的读者可查看本站专题:《Android通信方式总结》、《Android调试技巧与常见问题解决方法汇总》、《Android开发入门与进阶教程》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结

希望本文所述对大家Android程序设计有所帮助。

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