Question

我有两个相对布局。两者都具有填充父级的宽度和100个倾角的高度。我的要求是，当我点击第一个布局时，它应缩小到50dip高度，另一个扩展到150dip高度。这样做我得到了例外。请帮我如何在运行时更改布局宽度和高度。

    final LinearLayout RLChange = new LinearLayout(this);        
    RLChange.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
                                             LayoutParams.FILL_PARENT)); 
    RLChange.setOrientation(LinearLayout.VERTICAL);

    final LinearLayout RLGreen = new LinearLayout(this);        
    RLGreen.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
                                             300));
    RLGreen.setBackgroundColor(Color.GREEN);
    RLGreen.setOrientation(LinearLayout.HORIZONTAL);

    Button btnClick = new Button(this);        
    btnClick.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT));
    btnClick.setBackgroundColor(Color.RED);

    RLGreen.addView(btnClick);


    final LinearLayout RLYellow = new LinearLayout(this);        
    RLYellow.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
                                             200));
    RLYellow.setBackgroundColor(Color.YELLOW);


    btnClick.setOnClickListener(new View.OnClickListener() {            
        public void onClick(View view) {  
                    Toast.makeText(getApplicationContext(), "click", Toast.LENGTH_SHORT).show();
                    RLGreen.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
                            LayoutParams.FILL_PARENT));  
        }
     });  

    RLChange.addView(RLGreen);
    RLChange.addView(RLYellow);
    setContentView(RLChange);




Log Cat


03-10 11:01:35.328: INFO/NotificationService(574): enqueueToast pkg=Changewidth.com callback=android.app.ITransientNotification$Stub$Proxy@43948648 duration=0
03-10 11:01:35.388: DEBUG/AndroidRuntime(1505): Shutting down VM
03-10 11:01:35.388: WARN/dalvikvm(1505): threadid=3: thread exiting with uncaught exception (group=0x4001aa28)
03-10 11:01:35.398: ERROR/AndroidRuntime(1505): Uncaught handler: thread main exiting due to uncaught exception
03-10 11:01:35.449: ERROR/AndroidRuntime(1505): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:326)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:278)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.View.measure(View.java:7703)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.View.measure(View.java:7703)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:464)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:278)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.View.measure(View.java:7703)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:2989)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.View.measure(View.java:7703)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.ViewRoot.performTraversals(ViewRoot.java:747)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1613)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.os.Looper.loop(Looper.java:123)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at android.app.ActivityThread.main(ActivityThread.java:4203)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at java.lang.reflect.Method.invokeNative(Native Method)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at java.lang.reflect.Method.invoke(Method.java:521)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
03-10 11:01:35.449: ERROR/AndroidRuntime(1505):     at dalvik.system.NativeStart.main(Native Method)
03-10 11:01:35.479: INFO/Process(574): Sending signal. PID: 1505 SIG: 3
03-10 11:01:35.479: INFO/dalvikvm(1505): threadid=7: reacting to signal 3
03-10 11:01:35.619: INFO/dalvikvm(1505): Wrote stack trace to '/data/anr/traces.txt'
03-10 11:01:35.779: DEBUG/dalvikvm(623): GC freed 3557 objects / 196272 bytes in 448ms

Answer 1

在onClick Listener中添加此代码。

Button button = (Button) findViewById(view.getId());
LinearLayout rLGreen = ((LinearLayout) button.getParent());
rLGreen.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

它会起作用。

Answer 2

您好，您可以使用此代码更改布局的宽度和高度。

RelativeLayout.LayoutParams parms = new RelativeLayout.LayoutParams(width,height);
RelativeLayout layout1 = (RelativeLayout) findViewById(R.id.layout1);
lauout1.setLayoutParams(parms);

Answer 3

这些供应参数指向此视图的父级，指定应如何排列。 ViewGroup.LayoutParams有许多子类，它们对应于负责安排子女的ViewGroup的不同子类。

所以基本上，如果要将视图添加到另一个视图，则必须将视图的LayoutParams设置为父级使用的LayoutParams类型，否则将出现运行时错误。

Answer 4

您是否为特定视图使用了正确的LayoutParams类？尝试使用LinearLayout.LayoutParams。

Answer 5

请记住，Parent（父视图组）使用LayoutParams来确定如何布局此视图。

因此，例如，如果您有以下

LinearLayout
    RelativeLayout1
    RelativeLayout2

并且您想要更改RelativeLayout1或RelativeLayout2的宽度或高度，然后你需要做这样的事情。

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 200);
//Get handle to RelativeLayout1 assuming it is R1, you would call
R1.setLayoutParams(lp);

你还需要做同样的事情来改变RelativeLayout2的LayoutParams。

很容易忘记层次结构，并假设您需要设置子项的布局，但是它是父项确定支持哪些属性（例如，对齐或重力等）。

希望这会有所帮助。它烧了我几次......

是否可以在运行时更改Android中的布局宽度和高度？

5 个答案: