阅读五分钟，每日十点，和您一起终身学习，这里是程序员Android

本篇文章主要介绍 Android 开发中的部分知识点，通过阅读本篇文章，您将收获以下内容:

自定义View类实现自定义View 布局自定义View 素材Activity使用自定义View

自定义ItemToggleView 常用于Settings中，主要控制开关的开启与关闭。

自定义ItemToggleView实现效果如下：

开启.png

关闭.png

1. 自定义View类实现

public class SwitchControlView extends View implements OnTouchListener { private Bitmap bg_on, bg_off, slipper_btn; private float downX, nowX; private boolean onSlip = false; private boolean nowStatus = false; private OnChangedListener listener; public SwitchControlView(Context context) { super(context); init(); } public SwitchControlView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public void init() { bg_on = BitmapFactory.decodeResource(getResources(), R.drawable.on_btn); bg_off = BitmapFactory.decodeResource(getResources(), R.drawable.off_btn); slipper_btn = BitmapFactory.decodeResource(getResources(), R.drawable.white_btn); setOnTouchListener(this); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); Matrix matrix = new Matrix(); Paint paint = new Paint(); float x = 0; if (bg_on != null && bg_off != null) { if (nowX < (bg_on.getWidth() / 2)) { canvas.drawBitmap(bg_off, matrix, paint); } else { canvas.drawBitmap(bg_on, matrix, paint); } } if (onSlip) { if (nowX >= bg_on.getWidth()) x = bg_on.getWidth() - slipper_btn.getWidth() / 2; else x = nowX - slipper_btn.getWidth() / 2; } else { if (nowStatus) { x = bg_on.getWidth() - slipper_btn.getWidth(); } else { x = 0; } } if (x < 0) { x = 0; } else if (x > bg_on.getWidth() - slipper_btn.getWidth()) { x = bg_on.getWidth() - slipper_btn.getWidth(); } canvas.drawBitmap(slipper_btn, x, 0, paint); } @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { if (event.getX() > bg_off.getWidth() || event.getY() > bg_off.getHeight()) { return false; } else { onSlip = true; downX = event.getX(); nowX = downX; } break; } case MotionEvent.ACTION_MOVE: { nowX = event.getX(); break; } case MotionEvent.ACTION_UP: { onSlip = false; if (event.getX() >= (bg_on.getWidth() / 2)) { nowStatus = true; nowX = bg_on.getWidth() - slipper_btn.getWidth(); } else { nowStatus = false; nowX = 0; } if (listener != null) { listener.OnChanged(SwitchControlView.this, nowStatus); } break; } } invalidate(); return true; } public void setOnChangedListener(OnChangedListener listener) { this.listener = listener; } public void setChecked(boolean checked) { if (checked) { nowX = bg_off.getWidth(); } else { nowX = 0; } nowStatus = checked; } public interface OnChangedListener { public void OnChanged(SwitchControlView wiperSwitch, boolean checkState); }}

 <com.programandroid.CustomView.SwitchControlView android:id="@+id/switch_control_view" android:layout_width="100dp" android:layout_height="50dp" android:layout_gravity="center_vertical" />

toggle_off.png

toggle_on.png

4. Activity使用自定义View

 /** * InitSwitchView 自定义滑动开关实现 */ private void InitSwitchView() { // TODO Auto-generated method stub SwitchControlView wiperSwitch = (SwitchControlView) findViewById(R.id.switch_control_view); wiperSwitch.setChecked(true); wiperSwitch.setOnChangedListener(new OnChangedListener() { @Override public void OnChanged(SwitchControlView wiperSwitch, boolean checkState) { // TODO Auto-generated method stub if (checkState) { Toast.makeText(CustomViewMethods.this, "开启", 1).show(); } else { Toast.makeText(CustomViewMethods.this, "关闭", 1).show(); } } }); }

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