[英]Nested LinearLayouts Not Working
我已经尝试了两天了,以创建嵌套的线性布局(线性布局内的线性布局)很少成功。 我的主布局包含3个部分,分别按权重分别为45、45和10。当我运行该布局时,它似乎工作得很好。 我在不同颜色的屏幕上得到3个矩形。
创建“子”线性布局并将其添加到母版后,子布局将主导屏幕。 子线性布局的权重为35,35和30。因此,我希望在屏幕上看到顶部矩形分成3个较细的矩形。 相反,我得到了属于子布局的3个矩形。
有任何想法吗?
公共无效onCreate(捆绑保存的InstanceState){super.onCreate(savedInstanceState);
// Ensure there is a full screen blank window to work with
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
testViewA = new TestView(this);
testViewB = new TestView(this);
testViewC = new TestView(this);
testViewD = new TestView(this);
testViewE = new TestView(this);
testViewF = new TestView(this);
testViewA.color = 0;
testViewB.color = 1;
testViewC.color = 2;
testViewD.color = 3;
testViewE.color = 4;
testViewF.color = 5;
LinearLayout.LayoutParams paramsA = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .45f);
LinearLayout.LayoutParams paramsB = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .45f);
LinearLayout.LayoutParams paramsC = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .10f);
LinearLayout.LayoutParams paramsX = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .35f);
LinearLayout.LayoutParams paramsY = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .35f);
LinearLayout.LayoutParams paramsZ = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .30f);
paramsA.setMargins(10, 10, 10, 10);
paramsB.setMargins(10, 10, 10, 10);
testViewA.setLayoutParams(paramsA);
testViewB.setLayoutParams(paramsB);
testViewC.setLayoutParams(paramsC);
testViewD.setLayoutParams(paramsX);
testViewE.setLayoutParams(paramsY);
testViewF.setLayoutParams(paramsZ);
LinearLayout sub1 = new LinearLayout(this);
sub1.setOrientation(LinearLayout.VERTICAL);
sub1.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
sub1.addView(testViewD);
sub1.addView(testViewE);
sub1.addView(testViewF);
LinearLayout masterL = new LinearLayout(this);
masterL.setOrientation(LinearLayout.VERTICAL);
masterL.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
masterL.addView(sub1);
masterL.addView(testViewB);
masterL.addView(testViewC);
setContentView(masterL);
}
您的布局可以正常工作,但是您paramsA
为实际添加到masterL
LinearLayout
的新sub-layout( sub1
)添加LayoutParams
paramsA
,而是设置了一组新的LayoutParams
( width
和height
设置为FILL_PARENT
?!!?)使您的sub1
整个主版面。 您所要做的就是将正确的LayoutParams
设置为sub1
:
sub1.setLayoutParams(paramsA);
注意:正如其他人所说,嵌套权重对于性能而言并不太好,也许您可以使用其他类型的布局来改善布局。
仅当将子级的布局参数设置为wrap_content
并且它们中确实有额外的空格时,layout weight属性才有用。
首先是在xml中执行此操作,以Java编写时,它很难读取/维护布局代码(特别是当它这么简单时)。 几乎没有充分的理由在Java中编写此类属性。
其次,不要嵌套权重,权重对性能不利: http : //developer.android.com/resources/articles/layout-tricks-efficiency.html您应该能够提出不需要的替代布局嵌套的布局。
第三,如果您绝对必须使用嵌套权重(同样可以肯定也不要使用嵌套权重),则需要设置sub1的权重。 通过设置其高度以填充父级而不是权重为0,就可以告诉它填充屏幕,因此它完全按照您的指示进行操作就不足为奇了。
你需要 :
1)将要为其设置体重的孩子的身高设置为0 。
2)设置父级布局的setweightSum(子级权重之和)。
检查此代码作为我从您的代码示例中获得的示例:
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
TextView TextViewA = new TextView(this);
TextView TextViewB = new TextView(this);
TextView TextViewC = new TextView(this);
TextView TextViewD = new TextView(this);
TextView TextViewE = new TextView(this);
TextView TextViewF = new TextView(this);
TextViewA.setBackgroundColor( Color.RED);
TextViewB.setBackgroundColor( Color.BLACK);
TextViewC.setBackgroundColor( Color.BLUE);
TextViewD.setBackgroundColor( Color.CYAN);
TextViewE.setBackgroundColor( Color.GRAY);
TextViewF.setBackgroundColor( Color.GREEN);
LinearLayout.LayoutParams paramsA = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 0, .45f);
LinearLayout.LayoutParams paramsB = new LinearLayout.LayoutParams( LayoutParams.FILL_PARENT,0, .45f);
LinearLayout.LayoutParams paramsC = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,0, .10f);
LinearLayout.LayoutParams paramsX = new LinearLayout.LayoutParams( LayoutParams.FILL_PARENT, 0,.35f);
LinearLayout.LayoutParams paramsY = new LinearLayout.LayoutParams( LayoutParams.FILL_PARENT,0, .35f);
LinearLayout.LayoutParams paramsZ = new LinearLayout.LayoutParams( LayoutParams.FILL_PARENT,0, .30f);
paramsA.setMargins(10, 10, 10, 10);
paramsB.setMargins(10, 10, 10, 10);
TextViewA.setLayoutParams(paramsA);
TextViewB.setLayoutParams(paramsB);
TextViewC.setLayoutParams(paramsC);
TextViewD.setLayoutParams(paramsX);
TextViewE.setLayoutParams(paramsY);
TextViewF.setLayoutParams(paramsZ);
LinearLayout sub1 = new LinearLayout(this);
sub1.setOrientation(LinearLayout.VERTICAL);
sub1.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT,0,0.45f));
sub1.setWeightSum(1f);
sub1.addView(TextViewD);
sub1.addView(TextViewE);
sub1.addView(TextViewF);
LinearLayout masterL = new LinearLayout(this);
masterL.setOrientation(LinearLayout.VERTICAL);
masterL.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
masterL.setWeightSum(1f);
masterL.addView(sub1);
masterL.addView(TextViewB);
masterL.addView(TextViewC);
setContentView(masterL);
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