Question

我想动态添加带控件的布局，将来我想将这些数据保存到DB。

public void onClickAdd(View view) {
    LayoutInflater ltInflater = getLayoutInflater();
    final LinearLayout subLayoutFields = (LinearLayout) findViewById(R.id.subLayoutFields);
    LinearLayout subLayoutFields1;
    final View view1 = ltInflater.inflate(R.layout.sub_fields, subLayoutFields, true);
    subLayoutFields.setId(countID);
    countID++;
}

编译器没有成功完成。这有什么问题？我在

上出错了

subLayoutFields.setId(countID);

错误是：

报告两类问题：提供错误类型的资源标识符。例如，当您调用Resources.getString（int id）时应该传递R.string.something，而不是R.drawable.something。将错误的常量传递给期望其中一个特定的方法常量集。例如，在调用View＃setLayoutDirection时，参数必须是android.view.View.LAYOUT_DIRECTION_LTR或 android.view.View.LAYOUT_DIRECTION_RTL

谢谢...

Answer 1

喜欢这个

someView.setId(GenerateViewId.generateId());

这是您需要的UTIL

import android.annotation.SuppressLint;
import android.os.Build;
import android.view.View;

import java.util.concurrent.atomic.AtomicInteger;

public class GenerateViewId {

    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

    /**
     * Generate a value suitable for use in setId(int}.
     * This value will not collide with ID values generated at build time by aapt for R.id.
     *
     * @return a generated ID value
     */
    private static int generateViewId() {
        for (; ; ) {
            final int result = sNextGeneratedId.get();
            // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
            int newValue = result + 1;
            if (newValue > 0x00FFFFFF) {
                newValue = 1; // Roll over to 1, not 0.
            }
            if (sNextGeneratedId.compareAndSet(result, newValue)) {
                return result;
            }
        }
    }

    @SuppressLint("NewApi")
    public static int generateId() {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
            return generateViewId();
        }
        else {
            return View.generateViewId();
        }
    }

}

如何在android中正确使用setID？

1 个答案: