以编程方式在framelayout中覆盖imageview上的文本 - Android

时间:2011-10-09 22:15:47

标签: android textview imageview android-framelayout

我正在尝试在布局的中心和底部的framelayout中的图像上实现textview,如下所示:

http://developer.android.com/resources/articles/layout-tricks-merge.html

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">

<ImageView  
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 

    android:scaleType="center"
    android:src="@drawable/golden_gate" />

<TextView
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="20dip"
    android:layout_gravity="center_horizontal|bottom"

    android:padding="12dip"

    android:background="#AA000000"
    android:textColor="#ffffffff"

    android:text="Golden Gate" />

</FrameLayout>

我正在尝试以编程方式实现此功能但没有运气..我总是在左上角看到textview ..有人可以帮忙吗?这是我的代码:

FrameLayout frameLay = new FrameLayout(MainScreen.this);                            
LayoutParams layoutParamsFrame = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);

frameLay.setLayoutParams(layoutParamsFrame);

LinearLayout.LayoutParams layoutParamsImage= new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);

ImageView imageView= new ImageView(MainScreen.this);
imageView.setImageResource(R.drawable.movie);   
imageView.setLayoutParams(layoutParamsImage);

TextView theText=new TextView(MainScreen.this);
theText.setText("GOLDEN Gate");
theText.setTextColor(Color.WHITE);                           
theText.setTypeface(Typeface.DEFAULT_BOLD); 

LayoutParams layoutParamsText= new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

theText.setLayoutParams(layoutParamsText);

theText.setGravity(Gravity.CENTER_HORIZONTAL|Gravity.BOTTOM);

frameLay.addView(theText);
frameLay.addView(imageView);

2 个答案:

答案 0 :(得分:7)

你需要做的就是让textview填充像

这样的父母
LayoutParams layoutParamsText= new LayoutParams(LayoutParams.FILL__PARENT, 
        LayoutParams.FILL_PARENT); 

当您将重力设置为textview时,它意味着您正在告诉textview将其子项放在何处。但由于你的textview只有文字的大小,所以重力不会显示出任何差异。所以只需让textview填充父级。

但我认为RelativeLayout比FrameLayout更适合这个。使用RelativeLayout这是它的外观

RelativeLayout rLayout = new RelativeLayout(this);
LayoutParams rlParams = new LayoutParams(LayoutParams.FILL_PARENT
        ,LayoutParams.FILL_PARENT); 
rLayout.setLayoutParams(rlParams);

ImageView image= new ImageView(this); 
image.setImageResource(R.drawable.icon);    
image.setLayoutParams(rlParams);

RelativeLayout.LayoutParams tParams = new RelativeLayout.LayoutParams
        (LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
tParams.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
tParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
TextView text=new TextView(this); 
text.setText("GOLDEN Gate"); 
text.setTextColor(Color.WHITE);                            
text.setTypeface(Typeface.DEFAULT_BOLD);
text.setLayoutParams(tParams);

rLayout.addView(image);
rLayout.addView(text);
setContentView(rLayout);

答案 1 :(得分:1)

您可能希望尝试使用RelativeLayout作为容器,而不是FrameLayout。这样,您可以将重叠文本放在任何您想要的位置。应该适用于在RelativeLayout中将以下内容分配给TextView:

android:layout_alignParentBottom="true" and android:layout_centerInParent="true"

然后,您可以使用边距微调展示位置。