android上FragmentTabHost实现自己定义Tab Indicator
近期一直在做安卓开发,发现Tab布局能够用FragmentTabHost来实现,唯一不好的就是不能实现带图标的tabindicator, V4版本号中的尽管API有支持,可是不管怎么设置Drawable对象都不起作用,所以被逼无赖。发现indicator能够支持传进一个View做tabtitle,于是经过一番各种坑之后,我做了一个自己定义的Tab indicator,能够实现切换提示、显示带图标的tabtitle,同一时候支持滑动切换到不同Tab。
首先来看一下效果吧。
我的实现思路是这种:
第一步。当然是建立android V4版本号的FragmentTabHost的布局XML文件,普通情况下是不建议修改的,我是直接copy官网上的。
文件内容例如以下:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.v4.app.FragmentTabHost>第二步,建立自己定义的tab-indicator XML布局文件,实现自己定义tab title View。XML文件内容例如以下:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/tab_icon_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:contentDescription="icon" />
<TextView
android:id="@+id/tab_name_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000"
android:textSize="24sp" />
</LinearLayout>
<View
android:id="@+id/tab_border_line_1"
android:layout_width="fill_parent"
android:layout_height="3dp"
android:background="#ff0000" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/tab_icon_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:contentDescription="icon" />
<TextView
android:id="@+id/tab_name_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000"
android:textSize="24sp" />
</LinearLayout>
<View
android:id="@+id/tab_border_line_2"
android:layout_width="fill_parent"
android:layout_marginTop="1dp"
android:layout_height="3dp"
android:background="#ff0000" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/tab_icon_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:contentDescription="icon" />
<TextView
android:id="@+id/tab_name_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000"
android:textSize="24sp" />
</LinearLayout>
<View
android:id="@+id/tab_border_line_3"
android:layout_width="fill_parent"
android:layout_marginTop="0.5dp"
android:layout_height="3dp"
android:background="#ff0000" />
</LinearLayout>
</LinearLayout>第四步:当然是在MainActivity的onCreate方法中实现FragmentTabHost对象的初始化,建立一个真正的tab布局界面。
代码实现例如以下:
tabHost = (FragmentTabHost) findViewById(android.R.id.tabhost); tabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
第五步:也是最恶搞的一步,就是把View传到V4的每一个tab的indicator中去,这里要特别说明一下。事实上起作用的仅仅有第一个设置进去的View,其他尽管是必须的,可是无需不论什么设置。否则FragmentTabHost将无法正常工作。这个是我吐血得到的教训:代码例如以下:
ImageView piv = (ImageView)llView.findViewById(R.id.tab_icon_1);
TextView ptv = (TextView)llView.findViewById(R.id.tab_name_1);
ptv.setText("找人");
piv.setImageBitmap(personIcon);
piv = (ImageView)llView.findViewById(R.id.tab_icon_2);
ptv = (TextView)llView.findViewById(R.id.tab_name_2);
ptv.setText("圈子");
piv.setImageBitmap(circleIcon);
piv = (ImageView)llView.findViewById(R.id.tab_icon_3);
ptv = (TextView)llView.findViewById(R.id.tab_name_3);
ptv.setText("博客");
piv.setImageBitmap(blogIcon);
// 必须有这个,可是没有鸟用
View view2 = getLayoutInflater().inflate(R.layout.tab_indicator, (ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
View view3 = getLayoutInflater().inflate(R.layout.tab_indicator, (ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
Log.i("my-debug", "go here to setup tab content");
tabHost.addTab(
tabHost.newTabSpec("找人").setIndicator(llView),
PersonFragment.class, null);
tabHost.addTab(
tabHost.newTabSpec("圈子").setIndicator(view2),
CircleFragment.class, null);
tabHost.addTab(
tabHost.newTabSpec("博客").setIndicator(view3),
BlogFragment.class, null);第六步。加入手势側滑支持与现实默觉得第一个tab上的内容,实现代码例如以下:// 显示第一tab内容Fragment tabHost.setCurrentTab(0); View v = (View)llView.findViewById(R.id.tab_border_line_1); v.setBackgroundColor(Color.BLUE); mDetector = new GestureDetectorCompat(this, new MyGestureListener());当中手势側滑支持基于SimpleOnGestureListener类实现,同一时候要重载onTouchEvent方法才干够工作。
完整的MainActivity的代码例如以下:
package com.example.gesturedemo;
import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.view.GestureDetectorCompat;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
@SuppressLint("NewApi")
public class MainActivity extends FragmentActivity {
private FragmentTabHost tabHost;
private GestureDetectorCompat mDetector;
private View llView;
private static int tabIndex = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get tabhost and setup it
tabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
tabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
// load icons
Bitmap personIcon = BitmapFactory.decodeResource(this.getResources(), R.drawable.person);
Bitmap circleIcon = BitmapFactory.decodeResource(this.getResources(), R.drawable.circle);
Bitmap blogIcon = BitmapFactory.decodeResource(this.getResources(), R.drawable.blog);
// add tabs
Log.i("my-debug", "go here to setup tab header");
View mRoot = getLayoutInflater().inflate(R.layout.activity_main, null);
llView = getLayoutInflater().inflate(R.layout.tab_indicator, (ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
ImageView piv = (ImageView)llView.findViewById(R.id.tab_icon_1);
TextView ptv = (TextView)llView.findViewById(R.id.tab_name_1);
ptv.setText("找人");
piv.setImageBitmap(personIcon);
piv = (ImageView)llView.findViewById(R.id.tab_icon_2);
ptv = (TextView)llView.findViewById(R.id.tab_name_2);
ptv.setText("圈子");
piv.setImageBitmap(circleIcon);
piv = (ImageView)llView.findViewById(R.id.tab_icon_3);
ptv = (TextView)llView.findViewById(R.id.tab_name_3);
ptv.setText("博客");
piv.setImageBitmap(blogIcon);
// 必须有这个。可是没有鸟用
View view2 = getLayoutInflater().inflate(R.layout.tab_indicator, (ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
View view3 = getLayoutInflater().inflate(R.layout.tab_indicator, (ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
Log.i("my-debug", "go here to setup tab content");
tabHost.addTab(
tabHost.newTabSpec("找人").setIndicator(llView),
PersonFragment.class, null);
tabHost.addTab(
tabHost.newTabSpec("圈子").setIndicator(view2),
CircleFragment.class, null);
tabHost.addTab(
tabHost.newTabSpec("博客").setIndicator(view3),
BlogFragment.class, null);
// 显示第一tab内容Fragment
tabHost.setCurrentTab(0);
View v = (View)llView.findViewById(R.id.tab_border_line_1);
v.setBackgroundColor(Color.BLUE);
mDetector = new GestureDetectorCompat(this, new MyGestureListener());
}
@Override
public boolean onTouchEvent(MotionEvent event) {
this.mDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}
public void showNextTab()
{
tabIndex++;
if(tabIndex >= 3)
{
tabIndex = 0;
}
tabHost.setCurrentTab(tabIndex);
View v1 = (View)llView.findViewById(R.id.tab_border_line_1);
View v2 = (View)llView.findViewById(R.id.tab_border_line_2);
View v3 = (View)llView.findViewById(R.id.tab_border_line_3);
v1.setBackgroundColor(Color.RED);
v2.setBackgroundColor(Color.RED);
v3.setBackgroundColor(Color.RED);
if(tabIndex == 0) {
v1.setBackgroundColor(Color.BLUE);
}
else if(tabIndex == 1) {
v2.setBackgroundColor(Color.BLUE);
}
else if(tabIndex == 2) {
v3.setBackgroundColor(Color.BLUE);
}
}
class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
private static final String DEBUG_TAG = "Gestures";
@Override
public boolean onDown(MotionEvent event) {
Log.d(DEBUG_TAG, "onDown: " + event.getX());
return true;
}
@Override
public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
Log.d(DEBUG_TAG, "onFling: " + event1.getX());
float deltaX = event1.getX() - event2.getX();
Log.i("gesture", "deltaX : " + deltaX);
if(deltaX > 20) {
showNextTab();
}
else {
Toast.makeText(getApplicationContext(), "从右向左滑动開始应用...", Toast.LENGTH_SHORT).show();
}
return true;
}
}
}
使用的三个Fragment程序代码基本一样,无需一一给出,这里仅仅给出PersonFragment类的实现代码例如以下:package com.example.gesturedemo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class PersonFragment extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.common_content, container, false);
TextView tv = (TextView) v.findViewById(R.id.textView1);
tv.setText("相逢未必曾相识");
return v;
}
}
使用的布局文件XML内容例如以下:<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="36sp" android:gravity="center" android:text="tabhost" /> </LinearLayout>

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