ボタンクリックでページジャンプを実現

      （    ）,             ，   ListView     

 
  
1.xml  
  

    
    
       

 
  
 
  
 
  
2.      （        ）
  
package com.dujinlong.listview;
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	
	public void click(View view) {
		Intent  intent = new Intent();
		intent.setClass(MainActivity.this,ListViewLoader.class);
		startActivity(intent);
	}
}
  
 
  
 
  
package com.dujinlong.listview;
public class ListViewLoader extends ListActivity implements LoaderManager.LoaderCallbacks {

	//              
	SimpleCursorAdapter mAdapter;


	//               
	static final String[] PROJECTION = new String[] { ContactsContract.Data._ID, ContactsContract.Data.DISPLAY_NAME };


	//     
	static final String SELECTION = "((" + ContactsContract.Data.DISPLAY_NAME + " NOTNULL) AND ("
			+ ContactsContract.Data.DISPLAY_NAME + " != '' ))";


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);


		//              
		ProgressBar progressBar = new ProgressBar(this);
		progressBar.setLayoutParams(
				new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		progressBar.setIndeterminate(true);
		getListView().setEmptyView(progressBar);


		//                 
		ViewGroup root = (ViewGroup) findViewById(android.R.id.content);
		root.addView(progressBar);


		//                     
		String[] fromColumns = { ContactsContract.Data.DISPLAY_NAME };
		int[] toViews = { android.R.id.text1 }; // simple_list_item_1  TextView


		//                        
		//  null   cursor，   onLoadFinished()    
		mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, null, fromColumns, toViews, 0);
		setListAdapter(mAdapter);


		//      。            ，        。
		getLoaderManager().initLoader(0, null,this);
	}


	//              
	public Loader onCreateLoader(int id, Bundle args) {
		//        CursorLoad，           Cursor
		return new CursorLoader(this, ContactsContract.Data.CONTENT_URI, PROJECTION, SELECTION, null, null);
	}


	//                
	public void onLoadFinished(Loader loader, Cursor data) {
		//     cursor。（      ，         cursor）
		mAdapter.swapCursor(data);
	}


	//               ，      
	public void onLoaderReset(Loader loader) {
		//      onLoadFinished()    Cursor        。             。
		mAdapter.swapCursor(null);
	}


	@Override
	public void onListItemClick(ListView l, View v, int position, long id) {
		//          
		Toast.makeText(getApplicationContext(), "      ",0).show();
	}
}
  
 
  
 
  
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