UI控件之Button(按钮)和ImageButton(图像按钮)
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(一)概述
Button普通按钮跟ImageButton图像按钮的用法基本类似,至于图片相关的则和后面的ImageView相同,所以本节只对Button的用法进行讲解,另外Button是TextView的子类,所以TextView的很多属性也可以用到Button上,
(二)StateListDrawable简介
松实现,按下按钮时不同的按钮和颜色背景!
我们可以设置的属性:
No.1 —–实现按钮按下效果:
先准备3个.9.png图片作为按钮的drawable
运行效果:
实现代码:
drawable文件下新建xml文件
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" > <item android:state_pressed="true" android:drawable="@drawable/show1"/> <item android:state_enabled="true" android:drawable="@drawable/show2"/> <item android:drawable="@drawable/show3"/></selector>
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.android_buttontest.MainActivity" > <Button android:id="@+id/btnOne" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/show2" android:text="按钮" /> <Button android:id="@+id/btnTwo" android:layout_width="match_parent" android:layout_height="64dp" android:text="按钮不可用" /></LinearLayout>
MainActivity.java
public class MainActivity2 extends Activity { private Button Button1 ,Button2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_2); final Button Button1 = (Button) findViewById(R.id.btnOne); final Button Button2 = (Button) findViewById(R.id.btnTwo); Button2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (Button2.getText().toString().equals("按钮不可用")) { Button1.setEnabled(false); Button2.setText("按钮可用"); }else { Button1.setEnabled(true); Button2.setText("按钮不可用"); } } }); }}
No.2 —–使用颜色值绘制圆角按钮
运行效果:
点击按钮后,背景色会发生变化;
写完配置文件后记得在Button的background属性中设置即可;
实现代码:
color.xml
<?xml version="1.0" encoding="utf-8"?><resources> <color name="btn_press">#CDFF00</color> <color name="btn_edge">#ABCFFF</color> <color name="btn_danger_disable">#CC0FF7</color> <color name="btn_disable_edge">#DD90FF</color> <color name="btn_danger">#6D7F00</color> <color name="text_font_white">#FFFFFF</color></resources>
dimens.xml
<resources> <!-- Default screen margins, per the Android Design guidelines. --> <dimen name="btn_round_corner_radius">5dp</dimen></resources>
drawable在文件夹下新建的xml文件:
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_pressed="true"><shape> <solid android:color="@color/btn_press" /> <stroke android:width="1dp" android:color="@color/btn_edge" /> <corners android:radius="@dimen/btn_round_corner_radius" /> </shape></item> <item android:state_enabled="false"><shape> <solid android:color="@color/btn_danger_disable" /> <stroke android:width="1dp" android:color="@color/btn_disable_edge" /> <corners android:radius="@dimen/btn_round_corner_radius" /> </shape></item> <item><shape> <solid android:color="@color/btn_danger" /> <stroke android:width="1dp" android:color="@color/btn_edge" /> <corners android:radius="@dimen/btn_round_corner_radius" /> </shape></item></selector>
MainActivity.java文件跟main_activity.xml同No.1相同,只是Button的Background属性发生了变化;
No.3 实现Material Design水波效果的Button
运行效果:
PS:核心就是一个自定义View ,暂时不懂没事儿,我们后面会继续的说的;
实现代码:
自定义ImageButton —-MyButton.java
package com.example.android_button;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.os.SystemClock;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.ViewConfiguration;import android.widget.ImageButton;public class MyButton extends ImageButton { private static final int INVALIDATE_DURATION = 15; //每次刷新的时间间隔 private static int DIFFUSE_GAP = 10; //扩散半径增量 private static int TAP_TIMEOUT; //判断点击和长按的时间 private int viewWidth, viewHeight; //控件宽高 private int pointX, pointY; //控件原点坐标(左上角) private int maxRadio; //扩散的最大半径 private int shaderRadio; //扩散的半径 private Paint bottomPaint, colorPaint; //画笔:背景和水波纹 private boolean isPushButton; //记录是否按钮被按下 private int eventX, eventY; //触摸位置的X,Y坐标 private long downTime = 0; //按下的时间 public MyButton(Context context, AttributeSet attrs) { super(context, attrs); initPaint(); TAP_TIMEOUT = ViewConfiguration.getLongPressTimeout(); } /* * 初始化画笔 * */ private void initPaint() { colorPaint = new Paint(); bottomPaint = new Paint(); colorPaint.setColor(getResources().getColor(R.color.reveal_color)); bottomPaint.setColor(getResources().getColor(R.color.bottom_color)); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (downTime == 0) downTime = SystemClock.elapsedRealtime(); eventX = (int) event.getX(); eventY = (int) event.getY(); //计算最大半径: countMaxRadio(); isPushButton = true; postInvalidateDelayed(INVALIDATE_DURATION); break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: if(SystemClock.elapsedRealtime() - downTime < TAP_TIMEOUT){ DIFFUSE_GAP = 30; postInvalidate(); }else{ clearData(); } break; } return super.onTouchEvent(event); } @Override protected void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); if(!isPushButton) return; //如果按钮没有被按下则返回 //绘制按下后的整个背景 canvas.drawRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight, bottomPaint); canvas.save(); //绘制扩散圆形背景 canvas.clipRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight); canvas.drawCircle(eventX, eventY, shaderRadio, colorPaint); canvas.restore(); //直到半径等于最大半径 if(shaderRadio < maxRadio){ postInvalidateDelayed(INVALIDATE_DURATION, pointX, pointY, pointX + viewWidth, pointY + viewHeight); shaderRadio += DIFFUSE_GAP; }else{ clearData(); } } /* * 计算最大半径的方法 * */ private void countMaxRadio() { if (viewWidth > viewHeight) { if (eventX < viewWidth / 2) { maxRadio = viewWidth - eventX; } else { maxRadio = viewWidth / 2 + eventX; } } else { if (eventY < viewHeight / 2) { maxRadio = viewHeight - eventY; } else { maxRadio = viewHeight / 2 + eventY; } } } /* * 重置数据的方法 * */ private void clearData(){ downTime = 0; DIFFUSE_GAP = 10; isPushButton = false; shaderRadio = 0; postInvalidate(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); this.viewWidth = w; this.viewHeight = h; }}
主Activity没有任何更改。
color.xml
<?xml version="1.0" encoding="utf-8"?><resources> <color name="reveal_color">#FFFFFF</color> <color name="bottom_color">#3086E4</color> <color name="bottom_bg">#40BAF8</color></resources>
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <com.example.android_button.MyButton android:id="@+id/myBtn" android:layout_width="match_parent" android:layout_height="64dp" android:src="@drawable/baozou" android:background="@color/bottom_bg" android:scaleType="center"/></RelativeLayout>
好了,今天就到这里了,明天继续~~
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