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用Fragment实现界面跳转
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这个就会个布局,实现跳转都是看同学的。activity的布局 还有两个Fragment的布局掌握了,这个实现跳转不会。
首先是activity的布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context="com.example.administrator.tiaozhuan.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical"
android:id="@+id/show">
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show nextpage"
android:layout_gravity="center"
android:layout_marginTop="20dp"
android:id="@+id/btnshow"
android:onClick="onClick"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:orientation="vertical"
android:id="@+id/txtshow2">
</LinearLayout>
</LinearLayout>
fragment需要两个来进行跳转
第一个:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.administrator.tiaozhuan.FirstFragment">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="This is first fragment!"/>
</FrameLayout>
</FrameLayout>
第二个:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.administrator.tiaozhuan.SecondFragment">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="This is second fragment!"/>
</FrameLayout>
</FrameLayout>
下面是主界面java代码 这些都是看同学的修改的。。
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Fragment firstFragment;
private Fragment secondFragment;
private boolean skip = true;
private boolean exit = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
blankFragment = new firstFragment();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.main, blankFragment);
transaction.commit();
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_main:
jump();
break;
}
}
private void jump() {
boolean exit = true;
if (skip) {
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
if (secondFragment == null) {
secondFragment = new SecondFragment();
transaction.replace(R.id.main, secondFragment);
transaction.commit();
skip = false;
} else {
transaction.replace(R.id.main, secondFragment);
transaction.commit();
skip = false;
}
} else {
Toast.makeText(this, "This is second fragment!", Toast.LENGTH_LONG).show();
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK && exit) {
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
skip = true;
exit = false;
transaction.replace(R.id.main, blankFragment);
transaction.commit();
return false;
} else {
finish();
}
return super.onKeyDown(keyCode, event);
}
}
用Fragment实现界面跳转