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

问题描述：

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：

I am trying to implement a textview over an image in a framelayout at the center and bottom of the layout as it is seen here:

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>

我试图以编程方式实现此功能但没有运气..我总是将textview置于顶端左角..有人可以帮忙吗？这是我的代码：

I am trying to implement this programmatically but with no luck.. I always get the textview on the top left corner..can anyone help? Here is my code:

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);

答

所有你需要做的就是让textview填充父母喜欢

All you need to do ias make the textview to fill the parent like

LayoutParams layoutParamsText= new LayoutParams(LayoutParams.FILL__PARENT, 
        LayoutParams.FILL_PARENT);

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

When you set gravity to the textview, it mean you are telling the textview where to position its children. But since your textview only has the size of your text, the gravity wont show any difference. So just make the textview to fill the parent.

但我认为RelativeLayout比FrameLayout更适合这种情况。使用RelativeLayout这是它的样子

But I think RelativeLayout is a lot more suitable for this than the FrameLayout. Using the RelativeLayout this is how it would look

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);

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

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