小编Yur*_*yuk的帖子

我正在尝试使用数据绑定将drawable资源ID设置为ImageView的android:src

这是我的对象:

public class Recipe implements Parcelable {
    public final int imageResource; // resource ID (e.g. R.drawable.some_image)
    public final String title;
    // ...

    public Recipe(int imageResource, String title /* ... */) {
        this.imageResource = imageResource;
        this.title = title;
    }

    // ...
}

这是我的布局:

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

    <data>
        <variable
            name="recipe"
            type="com.example.android.fivewaystocookeggs.Recipe" />
    </data>

    <!-- ... -->

    <ImageView
        android:id="@+id/recipe_image_view"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:scaleType="centerCrop"
        android:src="@{recipe.imageResource}" />

    <!-- ... -->

</layout>

最后,活动类:

// ...

public class RecipeActivity extends AppCompatActivity {

    public static …

我想为toString方法创建IntelliJ Idea模板String.format而不是连接StringBuffer,等等.

例如,我有以下对象:

public class Foo {
    private int id;
    private String name;
    private List<String> values;
}

如果我toString默认为所有字段生成,则会生成:

@Override
public String toString() {
    return "Foo{" +
            "id=" + id +
            ", name='" + name + '\'' +
            ", values=" + values +
            '}';
}

但我想生成以下内容:

@Override
public String toString() {
    return String.format("Foo(id=%d, name=%s, values=%s)", id, name, values);
}

strings.xml中

<string name="my_string">Showing your number: %1$s</string>

ActivityExt.kt

fun Activity.showToast(textResId: Int, vararg formatArgs: String) {
    val text = getString(textResId, formatArgs)
    Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
}

MainActivity.kt

val number = 11
showToast(R.string.my_string, number.toString())

带有以下文字的吐司显示:

Showing your number: [Ljava.lang.String;@2cfa3b]

为什么会这样？