传入需要展示的Fragment的class对象，通过反射方式创建Fragment对象展示，再次调用start(Context， Class<?>)方法启动，可以在原来的fragment上层再显示一个，返回键可以返回上个fragment。且有切换动画
package com.android.jsbcmasterapp.base;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.text.TextUtils;
import android.util.Log;
import com.android.jsbcmasterapp.R;
import com.android.jsbcmasterapp.Res;
/**
* <pre>
* Description: 展示activity用的宿主;
* 调用{@link #start(Context, Class)}方法，传入需要展示的Fragment的class，
* singleInstance启动模式，支持启动多次展示多个fragment支持返回
*
* Author: xucunyang
* Time: 2021/3/4 15:45
* </pre>
*/
public class FragmentDisplayActivity extends BaseCompatActivity {
private static final String TAG = "FragmentDisplayActivity";
private static final String KEY_FRAGMENT_NAME = "fragment_name";
private FragmentManager fragmentManager;
private String mFragmentPath;
private FragmentTransaction mFragmentTransaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mFragmentPath = getIntent().getStringExtra(KEY_FRAGMENT_NAME);
fromNewIntent = false;
super.onCreate(savedInstanceState);
}
Log.i(TAG, "onCreate: ");
}
@Override
protected int getContentViews() {
return R.layout.activity_display_fragment;
}
@Override
protected void initViews() {}
@Override
protected void initListener() {}
@Override
protected void initData() {
Log.i(TAG, "initData: ");
if (TextUtils.isEmpty(mFragmentPath)) {
Log.w(TAG, "initData: fragmentPath is empty");
finish();
return;
}
Log.i(TAG, "initData: show fragment:" + mFragmentPath);
try {
Class<?> clazz = Class.forName(mFragmentPath);
fragment = (BaseFragment) clazz.newInstance();
fragmentManager = getSupportFragmentManager();
mFragmentTransaction = fragmentManager.beginTransaction();
if (fromNewIntent) {
mFragmentTransaction.setCustomAnimations(
R.anim.slide_enter,
R.anim.slide_exit,
R.anim.pop_left_enter,
R.anim.pop_left_exit
);
}
mFragmentTransaction.replace(Res.getWidgetID("frame_layout"), fragment);
mFragmentTransaction.addToBackStack(mFragmentPath);
mFragmentTransaction.commit();
} catch (ClassNotFoundException e) {
Log.w(TAG, "initData: ClassNotFoundException:" + e.getMessage());
e.printStackTrace();
} catch (IllegalAccessException e) {
Log.w(TAG, "initData: IllegalAccessException:" + e.getMessage());
e.printStackTrace();
} catch (InstantiationException e) {
Log.w(TAG, "initData: InstantiationException:" + e.getMessage());
e.printStackTrace();
}
}
private boolean fromNewIntent = false;
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.i(TAG, "onNewIntent: " + intent);
fromNewIntent = true;
if (intent != null) {
mFragmentPath = intent.getStringExtra(KEY_FRAGMENT_NAME);
initData();
} else {
Log.i(TAG, "onNewIntent: intent is null");
}
}
@Override
public void onBackPressed() {
Log.w(TAG, "onBackPressed: " + fragmentManager.getBackStackEntryCount());
if (fragmentManager != null && fragmentManager.getBackStackEntryCount() == 1) {
finish();
} else {
super.onBackPressed();
}
}
@Override
public void finish() {
FragmentManager fragmentManager = getSupportFragmentManager();
mFragmentTransaction = fragmentManager.beginTransaction();
mFragmentTransaction.setCustomAnimations(0, 0);
mFragmentTransaction.commit();
super.finish();
overridePendingTransition(R.anim.pop_left_enter, R.anim.pop_left_exit);
}
@Override
public void startActivity(Intent intent) {
super.startActivity(intent);
overridePendingTransition(R.anim.slide_enter, R.anim.activity_start_outgoing);
}
/**
* 展示fragment
*
* @param context 上下文
* @param fragmentCls fragment
*/
public static void start(Context context, Class<? extends Fragment> fragmentCls) {
if (fragmentCls != null) {
Log.i(TAG, "start: " + fragmentCls.getName());
Intent intent = new Intent(context, FragmentDisplayActivity.class);
intent.putExtra(KEY_FRAGMENT_NAME, fragmentCls.getName());
context.startActivity(intent);
if (context instanceof Activity) {
((Activity) context).overridePendingTransition(R.anim.slide_enter, R.anim.activity_start_outgoing);
} else {
Log.w(TAG, "start: context is not instance of Activity, " + context);
}
} else {
Log.w(TAG, "start: fragment is null");
}
}
}
使用的切换动画文件
activity_start_outgoing.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:fromXDelta="0%"
android:toXDelta="-100%" />
<alpha
android:duration="@android:integer/config_mediumAnimTime"
android:fromAlpha="1.0"
android:toAlpha="0.3" />
</set>
pop_left_enter.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:fromXDelta="-100%p"
android:toXDelta="0%p" />
<alpha
android:duration="@android:integer/config_mediumAnimTime"
android:fromAlpha="0.3"
android:toAlpha="1.0" />
</set>
pop_left_exit.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:fromXDelta="0%p"
android:toXDelta="100%p" />
<alpha
android:duration="@android:integer/config_mediumAnimTime"
android:fromAlpha="1.0"
android:toAlpha="0.3" />
</set>
slide_enter.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:fromXDelta="100%p"
android:toXDelta="0%p" />
<alpha
android:duration="@android:integer/config_mediumAnimTime"
android:fromAlpha="0.3"
android:toAlpha="1.0" />
</set>
slide_exit.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:fromXDelta="0%"
android:toXDelta="-100%" />
<alpha
android:duration="@android:integer/config_mediumAnimTime"
android:fromAlpha="1.0"
android:toAlpha="0.3" />
</set>
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