我想通过将select caller_name as " ", string_agg(coalesce(count::text, '-'), ', ') matrix
from (
select t1.name caller_name, t2.name called_name, count
from target_groups t1
cross join target_groups t2
left join (
select c1, c2, count(*)::int
from (
select g1.target_groups c1, g2.target_groups c2
from call_details c
join target_groups_map g1 on c.caller = g1.targets
join target_groups_map g2 on c.called = g2.targets
) c
group by 1, 2
order by 1, 2
) c
on t1.id = c1 and t2.id = c2
) sub
group by 1
order by 1;
| matrix
---------+------------
Group 1 | -, 1, -, 2
Group 2 | 1, -, -, 1
Group 3 | 1, -, 1, 1
Group 4 | -, -, -, -
(4 rows)
类扩展为sd卡中的图像来保存我创建的画布。在此视图中，我可以在触摸屏上创建任何行。
自定义视图类：
View我想将其保存为SD卡中的图像。
主要类如下：
public class TouchEventView extends View {
Paint paint=new Paint();
Path path=new Path();
Bitmap myBitmap;
public TouchEventView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
canvas.drawPath(path, paint);
myBitmap=Bitmap.createBitmap((int)canvas.getWidth(), (int)canvas.getHeight(), Config.RGB_565);// bitmap created
canvas=new Canvas(myBitmap);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
float xPos=event.getX();
float yPos=event.getY();
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
path.moveTo(xPos, yPos);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(xPos, yPos);
break;
case MotionEvent.ACTION_UP:
break;
default:
return false;
}
invalidate();
return true;
}
}
在主要课程中我使用菜单选项保存画布。点击此图片时，图片应保存在SD卡中。
我已经阅读了许多相关的线程，但都非常复杂。
那么有没有简单的方法可以将画布绘制为图像根据我的代码 在SD卡？
我是初学者所以请解释您的代码答案
我要做的另一件事就是 public class WriteOnScreenActivity extends ActionBarActivity {
private String state;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new TouchEventView(this,null));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.write_on_screen, 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.savepic) {
state=Environment.getExternalStorageState();
if(state.equals(Environment.MEDIA_MOUNTED)){
File folder;
folder=new File(Environment.getExternalStorageDirectory()+"/utkpictdrawn/");
if(!folder.exists()){
folder.mkdirs();
}
}else{
Toast.makeText(getBaseContext(), "Cannot Save Image.No SD Card !", Toast.LENGTH_LONG).show();
}
return true;
}
return super.onOptionsItemSelected(item);
}
}
保存所有内容
来自主要活动的菜单不在onOptionsItemSelected课程中！