来自XML的TextView和来自代码的差异

时间:2012-09-09 08:53:21

标签: android android-layout textview

当我从XML创建TextView时,里面的所有文本都是黑色的,但是当我从代码中创建它时它是灰色的。为什么呢?

来自代码和XML的元素的位置是相同的:主要布局是RelativeLayout(总是来自XML)。

下面的所有元素都是在一个案例中用XML创建的,第二个是从代码创建的:ScrollView - > TableLayout - > TableRow - > TextView的。

在所有层次结构中的两种情况下,我都没有设置颜色/样式/适应性参数。

代码:

RelativeLayout layout = (RelativeLayout) findViewById(R.id.o_layout);
ScrollView sv = new ScrollView(getApplicationContext());
TableLayout tl = new TableLayout(getApplicationContext());
float density = getResources().getDisplayMetrics().density;
tl.setPadding((int)(10 * density), (int)(4 * density), (int)(4 * density), 0);
for(String s: lista){
     add_row(tl, s);
}
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.BELOW, R.id.osobowe_search_field);
params.addRule(RelativeLayout.CENTER_HORIZONTAL);
sv.addView(tl);
layout.addView(sv, params);

private void add_row(TableLayout tl, String left_text){
    float density = getResources().getDisplayMetrics().density;

    TableRow tr = new TableRow(getApplicationContext());
    tr.setMinimumHeight((int)(30 * density));
    TableLayout.LayoutParams params = new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    params.bottomMargin = (int)(4 * density);

    TextView left = new TextView(getApplicationContext());
    left.setTextSize(android.util.TypedValue.COMPLEX_UNIT_DIP, 25);
    TableRow.LayoutParams left_params = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT);
    left_params.gravity = Gravity.CENTER_VERTICAL;
    left.setText(left_text);

    TextView right = new TextView(getApplicationContext());
    right.setTextSize(android.util.TypedValue.COMPLEX_UNIT_DIP, 18);
    right.setGravity(Gravity.CENTER_VERTICAL);
    TableRow.LayoutParams right_params = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT);
    right_params.leftMargin = (int)(10 * density);
    right_params.gravity = Gravity.CENTER_VERTICAL;
    //right_params.setMargins((int)(10 * density), 0, 0, 0);
    right_params.weight = 1;
    right.setText(get_desc("l", left_text));

    View line = new View(getApplicationContext());
    line.setBackgroundResource(R.drawable.line_on_bottom);
    TableLayout.LayoutParams line_params = new TableLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, (int)density);
    line_params.setMargins((int)(20 * density), 0, (int)(20 * density), 0);

    tr.addView(left, left_params);
    tr.addView(right, right_params);
    tl.addView(tr, params);
    tl.addView(line, line_params);


}

XML:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/o_details"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="10dip"
        android:paddingRight="4dip"
        android:paddingTop="4dip" >

        <TableRow
            android:id="@+id/o_row01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:minHeight="30dp"
            android:layout_marginBottom="4dip" >

            <TextView
                android:id="@+id/o_num01"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:text="@string/_"
                android:textSize="25dip"
                />

1 个答案:

答案 0 :(得分:1)

一个简单的解决方法如下 - 尝试使用其已知ID(根据上面的xml)检索TextView,在onResume()方法或add-row函数(上面的代码)中,并手动将颜色设置为黑色/灰色。函数setBackgroundColor会有所帮助。

用法 -

mytextview.setBackgroundColor(getResources().getColor(R.color.darkgrey)); 

(如果您使用其十六进制值在resources / color.xml中定义了颜色'darkgrey')