添加textviews阵列动态线性布局 [英] Adding array of textviews dynamically to linear layout

问题描述

我尝试添加我定义为公共变量textviews阵列，但是当我运行应用程序，它的力量，只要它进入for循环关闭。这是code：

 的LinearLayout myLayout =（的LinearLayout）findViewById（R.id.my_layout）;
            的LayoutParams LP =新的LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
            对=新的TextView [num_match + 1];
            对于（int类型l = 1; L＆LT; = num_match，L ++）
            {
                对[L] .setTextSize（15）;
                对[L] .setLayoutParams（LP）;
                对[L] .setId（升）;
                对[L] .setText（M1 [L] + - + M2 [L]）;
                myLayout.addView（对[L]）;
            }
 

解决方案

您需要创建新的TextViews投入TextView的数组，你跳过第一个索引（对[0] ），这会导致以后的麻烦：

 对=新的TextView [num_match]
对于（int类型l = 0; L＆LT; num_match，L ++）
{
    对[1] =新的TextView（本）;
    对[L] .setTextSize（15）;
    对[L] .setLayoutParams（LP）;
    对[L] .setId（升）;
    对[L] .setText（M1 [1 + 1] + - + M2 [1 + 1]）;
    myLayout.addView（对[L]）;
}
 

---

从您的意见，包括我这个简单的工作示例，以帮助您：

 公共类示例扩展活动{
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;        的LinearLayout myLayout =（的LinearLayout）findViewById（R.id.my_layout）;
        的LayoutParams LP =新的LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
        的TextView []成对=新的TextView [4];
        为（int类型l = 0; L＆4;：L ++）
        {
            对[1] =新的TextView（本）;
            对[L] .setTextSize（15）;
            对[L] .setLayoutParams（LP）;
            对[L] .setId（升）;
            对[L] .setText（（L + 1）+：东西）;
            myLayout.addView（对[L]）;
        }    }
}
 

通过布局的main.xml ：

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：ID =@ + ID / my_layout
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：方向=垂直/＆GT;
 

I tried to add an array of textviews which i defined as a public variable, but when i run the application, it force closes as soon as it gets into for loop. This is the code:

LinearLayout myLayout = (LinearLayout) findViewById(R.id.my_layout);
            LayoutParams lp = new LayoutParams( LayoutParams.WRAP_CONTENT,    LayoutParams.WRAP_CONTENT);
            pairs=new TextView[num_match+1];
            for(int l=1;l<=num_match;l++)
            {
                pairs[l].setTextSize(15);
                pairs[l].setLayoutParams(lp);
                pairs[l].setId(l);
                pairs[l].setText(m1[l]+" - "+m2[l]);
                myLayout.addView(pairs[l]);
            }

解决方案

You need to create new TextViews to put into the TextView array and you are skipping the first index (pairs[0]) which will lead to trouble later:

pairs=new TextView[num_match];
for(int l=0; l<num_match; l++)
{
    pairs[l] = new TextView(this);
    pairs[l].setTextSize(15);
    pairs[l].setLayoutParams(lp);
    pairs[l].setId(l);
    pairs[l].setText(m1[l + 1]+" - "+m2[l + 1]);
    myLayout.addView(pairs[l]);
}

---

From your comments, I included this simple working example to help you:

public class Example extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        LinearLayout myLayout = (LinearLayout) findViewById(R.id.my_layout);
        LayoutParams lp = new LayoutParams( LayoutParams.WRAP_CONTENT,    LayoutParams.WRAP_CONTENT);
        TextView[] pairs=new TextView[4];
        for(int l=0; l<4; l++)
        {
            pairs[l] = new TextView(this);
            pairs[l].setTextSize(15);
            pairs[l].setLayoutParams(lp);
            pairs[l].setId(l);
            pairs[l].setText((l + 1) + ": something");
            myLayout.addView(pairs[l]);
        }

    }
}

With the layout main.xml:

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

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