本篇文章给大家分享的是有关使用fragment怎么实现界面切换效果，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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MainActivity.java :
package com.crazy.gemi;
import android.app.SearchManager;
import android.content.Intent;
import android.graphics.Color;
import android.provider.SearchRecentSuggestions;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TextView;
import com.crazy.gemi.ui.cheaper.CheaperFragment;
import com.crazy.gemi.ui.cheaper.SearchSuggestionSampleProvider;
import com.crazy.gemi.ui.favor.FavorFragment;
import com.crazy.gemi.ui.more.MoreFragment;
import com.crazy.gemi.ui.near.NearFragment;
import com.crazy.gemi.ui.pocket.PocketFragment;
public class MainActivity extends FragmentActivity
implements View.OnClickListener, CheaperFragment.SearchResult{
private TextView[] textView = new TextView[5];
private View[] views = new View[5];
// 其中的 firstFragment 相当于是个中间变量
private Fragment firstFragment, nearFragment, cheaperFragment, favorFragment, pocketFragmnet, moreFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
initFragment();
}
private void init() {
textView[0] = (TextView)findViewById(R.id.near);
textView[1] = (TextView)findViewById(R.id.search_cheaper);
textView[2] = (TextView)findViewById(R.id.favor);
textView[3] = (TextView)findViewById(R.id.pocket);
textView[4] = (TextView)findViewById(R.id.more);
views[0] = findViewById(R.id.near_top_line);
views[1] = findViewById(R.id.cheaper_top_line);
views[2] = findViewById(R.id.favor_top_line);
views[3] = findViewById(R.id.pocket_top_line);
views[4] = findViewById(R.id.more_top_line);
textView[0].setOnClickListener(this);
textView[1].setOnClickListener(this);
textView[2].setOnClickListener(this);
textView[3].setOnClickListener(this);
textView[4].setOnClickListener(this);
}
private void initFragment() {
firstFragment = FavorFragment.newInstance();
favorFragment = firstFragment;
// 最先加载的 fragment
getSupportFragmentManager().beginTransaction().
add(R.id.frame_layout, favorFragment).commit();
textView[2].setTextColor(Color.BLACK);
views[2].setBackgroundColor(Color.parseColor("#FF6600"));
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.near:
// getSupportFragmentManager().beginTransaction().
// replace(R.id.frame_layout, NearFragment.newInstance()).commit();
if(nearFragment==null){
nearFragment= NearFragment.newInstance();
}
switchContent(firstFragment, nearFragment, getSupportFragmentManager().beginTransaction());
firstFragment = nearFragment;
selectStringAndBackgroundColor(0);
break;
case R.id.search_cheaper:
if(cheaperFragment==null){
cheaperFragment= CheaperFragment.newInstance();
}
switchContent(firstFragment, cheaperFragment, getSupportFragmentManager().beginTransaction());
firstFragment = cheaperFragment;
selectStringAndBackgroundColor(1);
break;
case R.id.favor:
if(favorFragment==null){
favorFragment= FavorFragment.newInstance();
}
switchContent(firstFragment, favorFragment, getSupportFragmentManager().beginTransaction());
firstFragment = favorFragment;
selectStringAndBackgroundColor(2);
break;
case R.id.pocket:
if(pocketFragmnet==null){
pocketFragmnet= PocketFragment.newInstance();
}
switchContent(firstFragment, pocketFragmnet, getSupportFragmentManager().beginTransaction());
firstFragment = pocketFragmnet;
selectStringAndBackgroundColor(3);
break;
case R.id.more:
if(moreFragment==null){
moreFragment= MoreFragment.newInstance();
}
switchContent(firstFragment, moreFragment, getSupportFragmentManager().beginTransaction());
firstFragment = moreFragment;
selectStringAndBackgroundColor(4);
break;
}
}
/**
* 通过 position 的位置改变文字和 View 的颜色
* @param position
*/
private void selectStringAndBackgroundColor(int position){
int sum = textView.length;
for (int i = 0; i < sum; i++) {
if (position == i) {
textView[i].setTextColor(Color.BLACK);
views[i].setBackgroundColor(Color.parseColor("#FF6600"));
} else {
textView[i].setTextColor(Color.GRAY);
views[i].setBackgroundColor(Color.parseColor("#f0f0f0"));
}
}
}
/**
* 判断是否添加了界面，以保存当前状态
*/
public void switchContent(Fragment from, Fragment to,
FragmentTransaction transaction) {
if (!to.isAdded()) { // 先判断是否被add过
transaction.hide(from).add(R.id.frame_layout, to)
.commit(); // 隐藏当前的fragment，add下一个到Activity中
} else {
transaction.hide(from).show(to).commit(); // 隐藏当前的fragment，显示下一个
}
}
}以上就是使用fragment怎么实现界面切换效果，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
