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- 关于activity_main.xml与fragment_main.xml
不习惯的可以这样处理:
1.删除fragment_main.xml整个文件
2.对activity_main.xml,删除里面的内容。然后切换到Graphy Layout,放入一个LinearLayout就可以
3.对MainActivity.java,可以删除下面红色标注的内容,再把MainActivity extends ActionBarActivity 改为MainActivity extends Activity :package com.zmcorp.weightcalculator;import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;public class MainActivity extends ActionBarActivity {@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}@Override
public boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {
}@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}}
还有一种最完全的改造方法就是:把两个XML文件都删除掉,还有默认的JAVA文件也删除掉,自己重新写,当然这种方法不适合初学者。
}@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
TextView myTextview = (TextView)rootView.findViewById(R.id.myTextview);
Button myButton = (Button)rootView.findViewById(R.id.myButton);
myTextview.setText("我的第一个TextView");
myButton.setText("我的第一个Button")
return rootView;
}
}
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() {
} @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
Button btnFirstButton = (Button) rootView.findViewById(R.id.btn_firstButton);
btnFirstButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(), "rootView.findViewById|fragment_main - -#", Toast.LENGTH_LONG).show();
}
});
return rootView;
}
}
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
##################################################
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
###########################################
public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {
}@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
/*下的这段代码
TextView myTextview = (TextView)findViewById(R.id.myTextview); //这里是找不到的
Button myButton = (Button)findViewById(R.id.myButton); //这里是找不到的
myTextview.setText("我的第一个TextView");
myButton.setText("我的第一个Button"); */
//去掉,然后在最后面的函数中添加实现
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() { }
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
//在这里添加实现楼主的想法
TextView myTextview = (TextView)rootView.findViewById(R.id.myTextview);
Button myButton = (Button)rootView.findViewById(R.id.myButton); //这样就能找到了
myTextview.setText("我的第一个TextView"); //这样就能生效了
myButton.setText("我的第一个Button")
//添加完毕
return rootView;
}
对应方法,View rootView = inflater.inflate(R.layout.fragment_main, container,false);
然后通过rootView 来查找findViewById(R.id.myTextview);