以往在写网页中我们经常用到百分比布局,现在在Android中我们也可以百分比布局,为屏幕适配带来一些方便。在使用时导入android-percent-support-lib-sample包。
使用说明:
1.需要在build.gradle文件当中导入以下内容:
dependencies {
compile 'com.android.support:percent:24.4.0'
}
2.这个库提供了包android.support.percent
这里包括了两种布局:
PercentRelativeLayout、PercentFrameLayout,通过名字就可以看出,这是继承自FrameLayout和RelativeLayout两个容器类;
android.support.percent.PercentRelativeLayout
android.support.percent.PercentFrameLayout
支持的属性有:
layout_widthPercent、layout_heightPercent、
layout_marginPercent、layout_marginLeftPercent、
layout_marginTopPercent、layout_marginRightPercent、
layout_marginBottomPercent、layout_marginStartPercent、layout_marginEndPercent。
可以看到百分比布局支持宽高,以及margin属性。
只要在开发过程中使用PercentRelativeLayout、PercentFrameLayout替换FrameLayout、RelativeLayout。
实例:
- <android.support.percent.PercentRelativeLayout
- xmlns:android="http://schemas./apk/res/android"
- xmlns:app="http://schemas./apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical">
- <TextView
- android:id="@+id/tv1"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="20%"
- app:layout_widthPercent="30%"
- android:background="#00ff00"
- android:gravity="center"
- android:text="w-30%,h-20%"/>
- <TextView
- android:id="@+id/tv2"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="20%"
- app:layout_widthPercent="70%"
- android:background="#ff0000"
- android:layout_toRightOf="@+id/tv1"
- android:gravity="center"
- android:text="w-70%,h-20%"/>
-
- <TextView
- android:id="@+id/tv3"
- app:layout_heightPercent="50%"
- app:layout_widthPercent="50%"
- android:layout_alignParentBottom="true"
- android:layout_width="0dp"
- android:background="#ffff00"
- android:layout_height="0dp"
- android:gravity="center"
- android:text="w-50%,h-50%"/>
- </android.support.percent.PercentRelativeLayout>
效果:
实例二:
- <android.support.percent.PercentFrameLayout
- xmlns:android="http://schemas./apk/res/android"
- xmlns:app="http://schemas./apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
- <TextView
- android:id="@+id/tv1"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="20%"
- app:layout_widthPercent="50%"
- android:background="#ff00ff"
- />
-
- <TextView
- android:id="@+id/tv2"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="20%"
- app:layout_widthPercent="50%"
- android:layout_gravity="right|top"
- android:background="#00ffff"/>
-
- <TextView
- android:id="@+id/tv3"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="20%"
- app:layout_widthPercent="80%"
- android:background="#ffff00"
- app:layout_marginTopPercent="30%"/>
-
- <ImageView
- android:id="@+id/iv"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_marginTopPercent="50%"
- app:layout_heightPercent="50%"
- app:layout_widthPercent="100%"
- android:src="@mipmap/ali"
- android:scaleType="centerCrop"/>
- </android.support.percent.PercentFrameLayout>
可以通过自定义实现线性百分比布局:
- public class PercentLinearLayout extends LinearLayout {
- private PercentLayoutHelper mPercentLayoutHelper;
-
- public PercentLinearLayout(Context context, AttributeSet attrs) {
- super(context, attrs);
-
- mPercentLayoutHelper = new PercentLayoutHelper(this);
- }
- @Override
- protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
- mPercentLayoutHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
- super.onMeasure(widthMeasureSpec, heightMeasureSpec);
- if (mPercentLayoutHelper.handleMeasuredStateTooSmall()) {
- super.onMeasure(widthMeasureSpec, heightMeasureSpec);
- }
- }
- @Override
- protected void onLayout(boolean changed, int l, int t, int r, int b) {
- super.onLayout(changed, l, t, r, b);
- mPercentLayoutHelper.restoreOriginalParams();
- }
- @Override
- public LayoutParams generateLayoutParams(AttributeSet attrs) {
- return new LayoutParams(getContext(), attrs);
- }
-
- public static class LayoutParams extends LinearLayout.LayoutParams
- implements PercentLayoutHelper.PercentLayoutParams {
- private PercentLayoutHelper.PercentLayoutInfo mPercentLayoutInfo;
-
- public LayoutParams(Context c, AttributeSet attrs) {
- super(c, attrs);
- mPercentLayoutInfo = PercentLayoutHelper.getPercentLayoutInfo(c, attrs);
- }
-
- @Override
- public PercentLayoutHelper.PercentLayoutInfo getPercentLayoutInfo() {
- return mPercentLayoutInfo;
- }
-
- @Override
- protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) {
- PercentLayoutHelper.fetchWidthAndHeight(this, a, widthAttr, heightAttr);
- }
-
- public LayoutParams(int width, int height) {
- super(width, height);
- }
-
-
- public LayoutParams(ViewGroup.LayoutParams source) {
- super(source);
- }
-
- public LayoutParams(MarginLayoutParams source) {
- super(source);
- }
-
- }
- }
- <com.xinyuliu.imageproject.custom.PercentLinearLayout
- xmlns:android="http://schemas./apk/res/android"
- xmlns:app="http://schemas./apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical">
- <TextView
- android:id="@+id/tv1"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="10%"
- app:layout_widthPercent="40%"
- android:background="#00ff00"
- app:layout_marginBottomPercent="5%"/>
-
- <TextView
- android:id="@+id/tv2"
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="10%"
- app:layout_widthPercent="60%"
- android:background="#ff0000"
- />
- <TextView
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="10%"
- app:layout_widthPercent="80%"
- app:layout_marginTopPercent="5%"
- android:background="#0000ff"/>
- </com.xinyuliu.imageproject.custom.PercentLinearLayout>
通过导入com.zhy.android.percent.support.PercentFrameLayout实现居中布局:
- <com.zhy.android.percent.support.PercentFrameLayout
- xmlns:android="http://schemas./apk/res/android"
- xmlns:app="http://schemas./apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
-
- <com.zhy.android.percent.support.PercentFrameLayout
- android:id="@+id/percentflayout01"
- android:layout_width="0dp"
- android:layout_height="0dp"
- android:layout_gravity="center"
- app:layout_heightPercent="50%w"
- app:layout_widthPercent="50%w"
- android:background="#ff0000">
- <TextView
- android:layout_width="0dp"
- android:layout_height="0dp"
- app:layout_heightPercent="25%w"
- app:layout_widthPercent="25%w"
- android:layout_gravity="center"
- android:background="#00ff00"/>
- </com.zhy.android.percent.support.PercentFrameLayout>
-
-
- </com.zhy.android.percent.support.PercentFrameLayout>
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