java - 以类似网格的方式添加框的按钮

Question

我想制作一个按钮，以这样的方式添加 View (类似盒子的东西)，第一个盒子出现在按钮下方，第二个盒子出现在第一个盒子的右边，第三个盒子出现在第一个盒子下面，依此类推，有点像这样:

[Button]
[1st][2nd]
[3rd][4th]
[5th] ...

我从一些好人那里得到了一些代码，但是虽然它确实添加了 View ，但它们彼此堆叠在一起，而不是以我上面显示的方式。有人可以帮我解决这个问题吗？

这是代码:

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;

public class teamCreateScreen extends Activity {

    int i = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.team_locate_layout);
    }

    public void createTeam(View view) {
        final RelativeLayout rlTeam = (RelativeLayout) findViewById(R.id.rlTeam);
        RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        Button tv = new Button(getApplicationContext());
        if (tv.getId() > 0) {
            relativeParams.addRule(RelativeLayout.BELOW, tv.getId());
        }
        tv.setText("New Team");
        tv.setId(i);
        rlTeam.addView(tv, relativeParams);
        i++;
    }
}

还有添加 View 的 XML 布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/rlTeam">

    <Button
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:id="@+id/teamAddBtn"
        android:text="+"
        android:textSize="30sp"
        android:onClick="createTeam"/>

</RelativeLayout> 

Answer 1

我认为最好的办法是这样做，例如 Android GridView

无论如何，试试这个代码:

public class MainActivity extends ActionBarActivity {

private int counter = 0;
private int lastId = -1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

public void createTeam(View view) {
    final RelativeLayout rlTeam = (RelativeLayout) findViewById(R.id.rlTeam);
    RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    Button tv = new Button(getApplicationContext());

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {

        tv.setId(Utils.generateViewId());

    } else {

        tv.setId(View.generateViewId());

    }

    if(lastId == -1) {
        relativeParams.addRule(RelativeLayout.BELOW, view.getId());
        counter++;
    } else if(counter == 1) {
        relativeParams.addRule(RelativeLayout.RIGHT_OF, lastId);
        relativeParams.addRule(RelativeLayout.ALIGN_TOP, lastId);
        counter++;
    } else if(counter == 2) {
        relativeParams.addRule(RelativeLayout.BELOW, lastId);
        counter = 1;
    }


    tv.setText("New Team");

    lastId = tv.getId();

    rlTeam.addView(tv, relativeParams);
}

Utils 类:

import java.util.concurrent.atomic.AtomicInteger;

/**
 * Created by Hema on 05/04/2015.
 */
public class Utils {
    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

    /**
     * Generate a value suitable for use in {@link #setId(int)}.
     * This value will not collide with ID values generated at build time by aapt for R.id.
     *
     * @return a generated ID value
     */
    public 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;
            }
        }
    }
}

我想向您展示为什么它不起作用: 当您创建这样的 View 时 Button tv = new Button(getApplicationContext()); 如果您调用 tv.getId() 将等于 -1，直到您调用 tv.setId(int id)。