在android中動態設置按鈕的寬度和高度

Question

我在 tablerow 中有一個按鈕，其文本根據數據庫中的兩種情況在“購買禮物”和“缺貨”之間變化。 所以我想在代碼中動態地將寬度和高度設置為 wrap_content 。

在類級別，我聲明了以下兩行：

LinearLayout.LayoutParams lp2;
lp2=new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,1);

我使用了一種方法來動態設置寬度和高度：

public void giftdetailssetting(String gift_name)
    {
        //btnbuygift.setWidth(200);
        btnbuygift.setText("Buy Gift");
        //btnbuygift.setEnabled(true);
        btnbuygift.setClickable(true);
        btnbuygift.setLayoutParams(lp2);

        // btnbuygift.setHeight(200);
        gift_src=dm.retrievegiftsrc(gift_name);
        Resources res = getResources();
        int resId=res.getIdentifier(gift_src,"drawable","com.example.shopkart");
        iv_gift.setImageResource(resId);

        List<String> giftvalues=dm.getgiftdetails(gift_name);
        giftprice=(String)giftvalues.get(1);
        txtgiftname.setText((String)giftvalues.get(0));
        txtgiftprice.setText("Rs "+giftprice);
        txtgiftquantity.setText((String)giftvalues.get(2));
        if(Integer.parseInt((String)giftvalues.get(2))==0)
        {
            btnbuygift.setText("OUT OF STOCK");
            btnbuygift.setLayoutParams(lp2);
            //btnbuygift.setEnabled(false);
            btnbuygift.setClickable(false);
        }

    }

但是我在 logcat 中收到以下錯誤：

04-24 14:57:00.240: E/AndroidRuntime(26781): FATAL EXCEPTION: main
04-24 14:57:00.240: E/AndroidRuntime(26781): Process: com.example.shopkart, PID: 26781
04-24 14:57:00.240: E/AndroidRuntime(26781): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.TableRow$LayoutParams
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.TableRow.getColumnsWidths(TableRow.java:299)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.TableLayout.findLargestCells(TableLayout.java:508)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.TableLayout.measureVertical(TableLayout.java:473)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.TableLayout.onMeasure(TableLayout.java:439)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.View.measure(View.java:16497)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.View.measure(View.java:16497)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.View.measure(View.java:16497)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.View.measure(View.java:16497)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.View.measure(View.java:16497)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.Choreographer.doFrame(Choreographer.java:544)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.os.Handler.handleCallback(Handler.java:733)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.os.Handler.dispatchMessage(Handler.java:95)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.os.Looper.loop(Looper.java:136)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at android.app.ActivityThread.main(ActivityThread.java:5017)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at java.lang.reflect.Method.invokeNative(Native Method)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at java.lang.reflect.Method.invoke(Method.java:515)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-24 14:57:00.240: E/AndroidRuntime(26781):    at dalvik.system.NativeStart.main(Native Method)

在這兩種情況下，我如何動態地將按鈕的寬度和高度設置為換行內容？？PLS HELP！！

Answer 1

您收到ClassCastException是因為您將LinearLayout.LayoutParam分配給TableRow類型的Button 。

改變

LinearLayout.LayoutParams lp2;
lp2=new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,1);

到

TableRow.LayoutParams lp2;
lp2=new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,1);

不要忘記為LayoutParams.WRAP_CONTENT導入正確的包，否則您將再次遇到相同的錯誤。

Answer 2

我希望當您嘗試使用LayoutParams您的問題會得到解決； 使用這個我們可以改變android中按鈕動態的大小！

例如;

button.setLayoutParams (new LayoutParams(50, LayoutParams.WRAP_CONTENT)

希望它會幫助你！

Answer 3

您可以使用以下代碼設置寬度和高度：

Button btnTag = new Button(this);
btnTag.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
tblRow.addView(btnTag);

Answer 4

查看您的 logcat，很明顯您將 LayoutParams 設置為 Linear layout 而不是 Tablerow 在您的情況下。

但根據文檔，表行的子項采用 MATCH_PARENT 作為其寬度。 因此，最好在其中嵌套一個帶有按鈕的水平線性布局，然后可以使用代碼本身調整其大小。