我在活动中使用导航栏。如果我点击导航栏中的任何项目 在默认情况下，它应该允许我们绘制一些东西。但是我试了很长时间，我无法做到。请尽快熟悉。下面是我正在使用的代码。
Painting.java
package com.example.painturselfnew;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public class Painting extends Activity {
private ListView mdrawerlist;
private DrawerLayout mdrawerlayout;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mdrawertitle;
private CharSequence mtitle;
private String[] mfragmenttitles;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_painting);
mtitle = mdrawertitle = getTitle();
mfragmenttitles = getResources().getStringArray(R.array.widgets);
mdrawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mdrawerlist = (ListView) findViewById(R.id.left_drawer);
mdrawerlist.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mfragmenttitles));
getActionBar().setDisplayShowHomeEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
mdrawerlist.setOnItemClickListener(new DrawerItemClickListener());
mDrawerToggle = new ActionBarDrawerToggle(this, mdrawerlayout,
R.drawable.ic_launcher, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mtitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mdrawertitle);
invalidateOptionsMenu();
}
};
mdrawerlayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.painting, menu);
return true;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
boolean draweropen = mdrawerlayout.isDrawerOpen(mdrawerlist);
menu.findItem(R.id.action_settings).setVisible(!draweropen);
return super.onPrepareOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
if (mdrawerlayout.isDrawerOpen(mdrawerlist)) {
mdrawerlayout.closeDrawer(mdrawerlist);
} else {
mdrawerlayout.openDrawer(mdrawerlist);
}
mdrawerlayout.openDrawer(mdrawerlist);
/*
* Toast.makeText(getApplicationContext(), "Options Selected",
* Toast.LENGTH_LONG).show();
*/
return true;
case android.R.id.home:
startActivity(new Intent(Painting.this, MainActivity.class));
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
private class DrawerItemClickListener implements
ListView.OnItemClickListener {
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
selectItem(position);
}
}
private void selectItem(int position) {
Fragment fragment = new Fragment();
Bundle args = new Bundle();
// args.putInt(Fragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
switch (position) {
case 0:
fragment = new Fragment1();
Toast.makeText(getApplicationContext(), "Camera Selected",
Toast.LENGTH_LONG).show();
break;
case 1:
fragment = new Fragment2();
Toast.makeText(getApplicationContext(), "Color Selected",
Toast.LENGTH_LONG).show();
break;
case 2:
/*
* PaintFragment fragment1; fragment1 = new PaintFragment();
*/
PaintFragment fragment1 = new PaintFragment();
Toast.makeText(getApplicationContext(), "Paint Selected",
Toast.LENGTH_LONG).show();
break;
case 3:
fragment = new Fragment4();
Toast.makeText(getApplicationContext(), "Save selected",
Toast.LENGTH_LONG).show();
break;
case 4:
fragment = new Fragment5();
Toast.makeText(getApplicationContext(), "Share Selected",
Toast.LENGTH_LONG).show();
break;
case 5:
fragment = new Fragment6();
Toast.makeText(getApplicationContext(), "ArtBy Selected",
Toast.LENGTH_LONG).show();
break;
case 6:
fragment = new Fragment7();
Toast.makeText(getApplicationContext(), "Refresh Selected",
Toast.LENGTH_LONG).show();
break;
}
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment).commit();
mdrawerlist.setItemChecked(position, true);
setTitle(mfragmenttitles[position]);
mdrawerlayout.closeDrawer(mdrawerlist);
}
@Override
public void setTitle(CharSequence title) {
mtitle = title;
getActionBar().setTitle(mtitle);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
PainitngFragment.java
package com.example.painturselfnew;
import android.annotation.TargetApi;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Build;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class PaintFragment extends Activity {
/*private static int displayWidth = 0;
private static int displayHeight = 0;
*/
/*
* @Override public void onCreate(Bundle savedInstanceState) {
* super.onCreate(savedInstanceState);
* //setContentView(R.layout.activity_fragment3); //setContentView(new
* MyView(this));
*
*
* }
*/
/*public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {*/
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
BrushView view=new BrushView(this);
setContentView(view);
addContentView(view.btnEraseAll, view.params);
/*
* View view = inflater.inflate(R.layout.activity_fragment3, container,
* false);
*/
// getActivity();
/*
* Display display =
* ((WindowManager)this.getSystemService(Context.WINDOW_SERVICE
* )).getDefaultDisplay(); displayWidth = display.getWidth();
* displayHeight = display.getHeight();
*/
//ImageView iv = (ImageView) view.findViewById(R.id.imageView1);
/*
* iv.setOnClickListener(new View.OnClickListener() {
*
* @Override public void onClick(View arg0) { // TO DO Auto-generated
* method stub
*
* BrushView view = new BrushView(getActivity()); //setContentView(new
* BrushView(this)); } });
*/
//return view;
}
@Override
protected void onPause() {
super.onPause();
finish();
}
public class BrushView extends View {
private Paint brush = new Paint();
private Path path = new Path();
public Button btnEraseAll;
public LayoutParams params;
public BrushView(Context paintFragment) {
super(paintFragment);
brush.setAntiAlias(true);
brush.setColor(Color.BLUE);
brush.setStyle(Paint.Style.STROKE);
brush.setStrokeJoin(Paint.Join.ROUND);
brush.setStrokeWidth(15f);
btnEraseAll = new Button(paintFragment);
btnEraseAll.setText("Erase Everything!!");
params = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
btnEraseAll.setLayoutParams(params);
btnEraseAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// reset the path
path.reset();
// invalidate the view
postInvalidate();
}
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float pointX = event.getX();
float pointY = event.getY();
// Checks for the event that occurs
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(pointX, pointY);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(pointX, pointY);
break;
case MotionEvent.ACTION_UP:
break;
default:
return false;
}
// Force a view to draw.
postInvalidate();
return false;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawPath(path, brush);
}
}
}
提前致谢...