教你如何最快写出酷炫的dialog对话框
image.png 在实际开发中，系统自带的dialog样式太丑，往往都是自定义一个布局，通过LayoutInflater.inflate(XXX)打一个布局渲染进去的。但是这样做也有缺点，比如下面这张图，你布局里面是不好处理的： 首先，看一下效果图： image.png 那么遇到这种情况怎么做呢？下面我来分析一下： 一、右边的那个锁是一个状态选择器，我在drawable下面写一个状态选择器,我取名为radio_button_button_selector.xml： <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/ic_radio_button_select" android:state_activated="true"></item> <item android:drawable="@drawable/ic_radio_button_select" android:state_pressed="true"></item> <item android:drawable="@drawable/ic_radio_button_normal"></item> </selector> 二、改写系统的布局，我取名为：select_dialog_singlechoice.xml 具体如下： <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text1" android:layout_width="match_parent" android:layout_height="?android:attr/listPreferredItemHeightSmall" android:checkMark="@drawable/radio_button_button_selector" android:gravity="center_vertical" android:paddingEnd="?android:attr/listPreferredItemPaddingEnd" android:paddingStart="?android:attr/listPreferredItemPaddingStart" android:textAppearance="?android:attr/textAppearanceListItemSmall"/> </LinearLayout> 三、然后在activity的布局： <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="点击就有弹窗"/> </LinearLayout> 四、最后就是mainactivity里面的代码： /** * 弹窗的背景色的设置 */ public class MainActivity3 extends AppCompatActivity implements View.OnClickListener{ private CharSequence[] items = new CharSequence[]{"苹果", "西瓜", "香蕉", "葡萄","你想要啥水果自己选。。"}; private Button mButton; ArrayAdapter<SpannableStringBuilder> adapter; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main3); mButton = (Button) findViewById(R.id.button3); mButton.setOnClickListener(this); ArrayList<SpannableStringBuilder> chooseTypeList = new ArrayList<>(); SpannableStringBuilder builder1 = new SpannableStringBuilder(); SpannableString ss1 = new SpannableString("湖北省 - 省会 - 武汉市"); //设置字体(default,default-bold,monospace,serif,sans-serif) ss1.setSpan(new TypefaceSpan("monospace"), 0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); //设置字体大小（绝对值,单位：像素） //第二个参数 如果为true，表示前面的字体大小单位为dip，否则为像素 ss1.setSpan(new AbsoluteSizeSpan(60), 0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.BLACK), 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(255,0,0)),1, 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(255,165,0)), 2, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(255,255,0)), 6, 7, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(0,255,0)), 7, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(0,127,255)), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(0,0,255)), 12, 13, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss1.setSpan(new ForegroundColorSpan(Color.rgb(139,0,255)), 13, ss1.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); builder1.append(ss1); SpannableStringBuilder builder2 = new SpannableStringBuilder(); SpannableString ss2 = new SpannableString("浙江省 - 省会 - 杭州市"); //设置字体(default,default-bold,monospace,serif,sans-serif) ss2.setSpan(new TypefaceSpan("monospace"), 0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.BLACK), 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(255,0,0)),1, 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(255,165,0)), 2, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(255,255,0)), 6, 7, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(0,255,0)), 7, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(0,127,255)), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(0,0,255)), 12, 13, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss2.setSpan(new ForegroundColorSpan(Color.rgb(139,0,255)), 13, ss2.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); builder2.append(ss2); SpannableStringBuilder builder3 = new SpannableStringBuilder(); SpannableString ss3 = new SpannableString("江苏省 - 省会 - 南京市"); //设置字体(default,default-bold,monospace,serif,sans-serif) ss3.setSpan(new TypefaceSpan("monospace"), 0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.BLACK), 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(255,0,0)),1, 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(255,165,0)), 2, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(255,255,0)), 6, 7, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(0,255,0)), 7, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(0,127,255)), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(0,0,255)), 12, 13, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss3.setSpan(new ForegroundColorSpan(Color.rgb(139,0,255)), 13, ss3.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); builder3.append(ss3); SpannableStringBuilder builder4 = new SpannableStringBuilder(); SpannableString ss4 = new SpannableString("广东省 - 省会 - 广州市"); //设置字体(default,default-bold,monospace,serif,sans-serif) ss4.setSpan(new TypefaceSpan("monospace"), 0,3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.BLACK), 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(255,0,0)),1, 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(255,165,0)), 2, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(255,255,0)), 6, 7, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(0,255,0)), 7, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(0,127,255)), 11, 12, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(0,0,255)), 12, 13, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); ss4.setSpan(new ForegroundColorSpan(Color.rgb(139,0,255)), 13, ss4.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); builder4.append(ss4); chooseTypeList.add(builder1); chooseTypeList.add(builder2); chooseTypeList.add(builder3); chooseTypeList.add(builder4); adapter = new ArrayAdapter<>( this, R.layout.select_dialog_singlechoice, R.id.text1, chooseTypeList); } @Override public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setSingleChoiceItems(adapter, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity3.this, items[which], Toast.LENGTH_SHORT).show(); } }) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }) .show(); } } 最终效果如下，是不是很酷炫？ image.png
