安卓模板

轮播图

依赖

implementation 'io.github.youth5201314:banner:2.2.2'
implementation 'com.github.bumptech.glide:glide:4.14.2'

添加权限

<uses-permission android:name="android.permission.INTERNET" />

layout参照"item_banner"

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.youth.banner.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="250dp"/>

</LinearLayout>

其他布局中引入：

<?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">
    
    <include layout="@layout/item_banner"/>
    
</LinearLayout>

activity中：

Banner banner = findViewById(R.id.banner);

//模拟图片集合
List<String> stringList = new ArrayList<>();
//stringList.add("图片链接");
stringList.add("https://img.zcool.cn/community/01af785bb96e64a8012099c842e316.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/01446c5bb96e2da8012099c883c002.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/0194525bb96e51a8012099c8fb70c5.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/0118935bb96e22a801213dea403d56.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/015a4d5bb96e5fa801213deacbb786.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/0128535bb96e85a8012099c86c34f9.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/014c645bb96e92a801213dea6e7782.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/01516e5bb96e9fa8012099c88933ea.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");
stringList.add("https://img.zcool.cn/community/0108395bb96ea1a801213dea462e1a.jpg?x-oss-process=image/auto-orient,1/resize,m_lfit,w_1280,limit_1/sharpen,100/format,webp/quality,q_100");

//轮播图
banner.setAdapter(new BannerImageAdapter<String>(stringList)
{
    @Override
    public void onBindView(BannerImageHolder holder, String data, int position, int size)
    {
        Glide.with(holder.itemView).load(data).apply(RequestOptions.bitmapTransform(new RoundedCorners(30))).into(holder.imageView);
    }
});
//设置指示器颜色和形状
banner.setIndicator(new CircleIndicator(this));
banner.setIndicatorNormalColor(R.color.gray0);
banner.setIndicatorSelectedColor(R.color.blue);
//添加画廊效果
banner.setBannerGalleryEffect(50, 10);

设置图片圆角：

注意：如果添加了画廊效果，圆角效果会消失。 法一：在banner_item中添加：

app:banner_round_top_left="true"
app:banner_round_top_right="true"
app:banner_round_bottom_left="true"
app:banner_round_bottom_right="true"
app:banner_radius="50dp"

法二：在activity中添加：

banner.setBannerRound(100);

更多功能

参照 链接教程 官网

---

从相册选择照片

依赖

implementation 'com.github.lovetuzitong:MultiImageSelector:1.2'

权限

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
    tools:ignore="ProtectedPermissions" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

申请权限

boolean AskPermission()
{
    if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
    {
        Toast.makeText(context, "当前存储卡不可用", Toast.LENGTH_SHORT).show();
        return false;
    }
    if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
            || ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
            || ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
    {
        ActivityCompat.requestPermissions(activity, new String[]{
                        Manifest.permission.CAMERA,
                        Manifest.permission.READ_EXTERNAL_STORAGE,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE},
                REQUEST_EXTERNAL_STORAGE_CODE);
        return false;
    }
    return true;
}

activity中

• 开始选择照片

Intent intent = new Intent(context, MultiImageSelectorActivity.class);
// 是否显示调用相机拍照
intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, true);
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, 最大图片选择数量);
intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, MultiImageSelectorActivity.MODE_MULTI);
startActivityForResult(intent, mode);

• 拍照
  在清单文件中添加路径

<!--File uri 路径-->
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.example.mobilelearning.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths" />
        </provider>

• activity中

void TakePhoto(int mode)
    {
        File outputImage = new File(context.getExternalCacheDir(), getHeadImgName());
        try
        {
            if (outputImage.exists())
            {
                outputImage.delete();
            }
            outputImage.createNewFile();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
        // 判断安卓的版本是否高于7.0，高于则调用高于的方法，低于则调用低于的方法
        if (Build.VERSION.SDK_INT >= 24)
        {
            imageUri = FileProvider.getUriForFile(activity,
                    "com.example.mobilelearning.fileprovider", outputImage);
        }
        else
        {
            imageUri = Uri.fromFile(outputImage);
        }
        // 启动相机程序
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        startActivityForResult(intent, mode);
    }

• 结束后返回结果

//如果是fragment，在主activity中也需要重写该方法

public void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        //  activity.RESULT_OK!!!需要在父活动中将RESULT_OK设置为true！！！
        if (resultCode != Activity.RESULT_OK)
            return;
        switch (requestCode)
        {
            case CHOOSE_PHOTO:
                ArrayList<String> path = data.getStringArrayListExtra(MultiImageSelectorActivity.EXTRA_RESULT);
                //do something, 照片路径储存在path
                break;
            default:
                break;
        }
    }

主activity中的重写

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        View Banner = findViewById(R.id.banner);
        Banner.setVisibility(View.GONE);

        setResult(RESULT_OK);
        super.onActivityResult(requestCode, resultCode, data);
    }

---

简单对话框

导入依赖

implementation 'com.github.Shashank02051997:FancyAlertDialog-Android:0.3'

activity中

FancyAlertDialog.Builder
    .with(this)
    .setTitle("Rate us if you like the app")
    .setBackgroundColor(Color.parseColor("#303F9F"))
    .setMessage("Do you really want to Exit ?")
    .setNegativeBtnText("Cancel")
    .setPositiveBtnBackground(Color.parseColor("#FF4081"))
    .setPositiveBtnText("Rate")
    .setNegativeBtnBackground(Color.parseColor("#FFA9A7A8"))
    .setIcon(R.drawable.hand, View.VISIBLE)
    .setAnimation(Animation.POP)
    .isCancellable(true)
    .onPositiveClicked(dialog -> Toast.makeText(this, "Rate", Toast.LENGTH_SHORT).show())
    .onNegativeClicked(dialog -> Toast.makeText(this, "Cancel", Toast.LENGTH_SHORT).show())
    .build()
    .show();

推荐颜色和图案搭配

蓝-#30409F-R.drawable.exclamatory
绿-#378E3C-R.drawable.yes
橙-#F57C00-R.drawable.hand
红-#D23030-R.drawable.no

单选对话框

activity中

    public void singleDialog(String[] options, String title)
    {
        new AlertDialog.Builder(this)
                .setTitle(title)
                .setIcon(R.mipmap.ic_launcher)
                .setSingleChoiceItems(options, -1, (dialog, which) ->
                {
                    //which是选项的下标，从0开始
                    Toast.makeText(this, "选中了第" + which + "个", Toast.LENGTH_SHORT).show();
                })
                .setPositiveButton("确定", (dialog, which) -> Toast.makeText(this, "确定", Toast.LENGTH_SHORT).show())
                .show();
    }

多选对话框

    public void multiDialog(String[] options, String title)
    {
        boolean[] flags = new boolean[options.length];
        new AlertDialog.Builder(this).setTitle(title)
                .setIcon(R.mipmap.ic_launcher)
                //第一个参数多选的选择数组，第二个多选的选择状态数组，如果null，则默认全部没选，第三个是选中选择的事件
                .setMultiChoiceItems(options, null, (dialog, which, isChecked) -> flags[which] = isChecked)
                .setPositiveButton("确定", (dialog, which) ->
                {
                    //flags代表所有选项的状态
                    //do something ...
                    
                    //将所有选项的状态改为未选中状态
                    Arrays.fill(flags, false);
                }).show();
    }

自定义传值对话框

编写layout(i.e. item_dialog.xml)
编写activity(i.e. item_dialog.java)

public class item_dialog extends Dialog implements View.OnClickListener
{
    1. 声明变量，就是自定义对话框有几个控件，比如：
    private EditText edit1, edit2;
    private Button yes, no;
    Activity activity;
    
    2. 要从主activity传给对话框的值--从构造函数传入对话框类，比如：
    public item_dialog(Activity activity,String edit_default)
    {
        edit1.setText(edit_default);
        this.
    }
    
    3. 将laytou中的对话框与定义的变量关联起来
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.item_layout);
        setCanceledOnTouchOutside(false);
        //初始化控件
        //这里省略以下过程：通过findViewById的方法对变量进行定义
        yes.setOnClickListener(this);
        no.setOnClickListener(this);
        //这里是为了调整宽度，不知道为啥对话框弹出式宽度变得很窄，所以需要以下代码
        Window dialogWindow = this.getWindow();
        WindowManager m = activity.getWindowManager();
        Display d = m.getDefaultDisplay(); // 获取屏幕宽、高度
        WindowManager.LayoutParams p = dialogWindow.getAttributes(); // 获取对话框当前的参数值
        p.width = (int) (d.getWidth() * 0.95); // 宽度设置为屏幕的0.65，根据实际情况调整
        dialogWindow.setAttributes(p);
    }
    
    4. 如果需要传值，比如按下yes的时候，把编辑框中的文本传给主activity，则设立一个监听器接口
    public interface TestListener
    {
        //将要传回的值写在括号中，第一个参数要写dialog
        void yesListenter(Dialog dialog, EditText title, EditText content);
    }
    在变量处添加：
    private TestListener testListener;
    在构造函数处添加一个参数 TestListener testListener,且this.testListener = testListener;
    在yes按钮的监听器中进行传值：
    testListener.yesListener(this, edit1.getText().toString(), edit2.getText().toString());
    当然，可以选择传文本，也可以选择直接把控件（edit1,edit2）传到主activity，如果还需要对控件做些什么的话。
}

编写主activity
直接new一个item_dialog类，然后在里面重写接口。
！记得最后要.show();

---