How to reverse the childs position in RelativeLayout

by GPU » Fri, 30 Oct 2009 20:45:05 GMT


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 By reversing the  mRules - result : not working in all places

By changing the child.onLayout - mLeft and nRight? not getting the
childs exact position

By changing applySizeRules()
like changing getRelatedViewParams(rules, LEFT_OF); to
getRelatedViewParams(rules, RIGHT_OF);

or is their any other way to reverse it;

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Other Threads

1. Trackball doesn't give me click events, but touch screen does

I have a list activity that creates a header row above the data rows
from the adapter. I want to receive click events when the user selects
the header or a data row (but my data rows have check boxes in them,
so this part is tricky). When I use the touch screen, I get this
expected behavior:

1. Tapping on any row causes a click event and a dialog appears.
2. Long-pressing on a data row causes a context menu to appear.
3. Long-pressing on the header row does *not* show the context menu.

However, when I use the arrow keys (emulator) or trackball (G1), I get
this unexpected behavior:

1. Selecting any row fails to cause any click events, even though the
row's appearance changes like it's being clicked.
2. Long-pressing on the header row *does* show the context menu, which
I don't want.
3. Occasionally, it doesn't focus the correct row when I move up or
down (e.g. it skips from the header to the last data row).

What am I doing wrong?

Jesse

(Complete project: http://hansprestige.com/android/DpadBug.zip)

////////// DpadActivity.java //////////

package com.hansprestige.DpadBug;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class DpadBugActivity extends ListActivity {
        private static final int DIALOG_TEST = 1;

    private OnClickListener testListener = new OnClickListener() {
        public void onClick(View v) {
                showDialog(DIALOG_TEST);
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ListView lv = getListView();
        registerForContextMenu(lv);

        findViewById(android.R.id.empty).setOnClickListener
(testListener);

        View addItem = getLayoutInflater().inflate
(R.layout.list_header,
                        null, false);
        addItem.setOnClickListener(testListener);
        lv.addHeaderView(addItem);

        fillData();
}

    private void fillData()
    {
        String[] items = new String[] { "Item A", "Item B", "Item C" };
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.list_row, R.id.TextView01, items) {
                @Override
                public View getView(int position, View convertView, ViewGroup
parent) {
                        View v = super.getView(position, convertView, parent);
                        v.setOnClickListener(testListener);
                        v.setLongClickable(true);
                        return v;
                }
        };
        setListAdapter(adapter);
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DIALOG_TEST:
                return new AlertDialog.Builder(this)
                        .setTitle("Hello!")
                        .setPositiveButton("Close", null)
                        .create();
        }
        return super.onCreateDialog(id);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
                ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.add("Context item");
    }
}

////////// main.xml //////////

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
        android:layout_width="fill_parent"
    android:layout_height="fill_parent">

            <ListView android:id="@+id/android:list"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:focusable="false" />
            <include android:id="@+id/android:empty" layout="@layout/
list_header" />
</LinearLayout>

////////// list_header.xml //////////

<?xml version="1.0" encoding="UTF-8"?>
<!-- This seems way too complicated, but the outer view's layout
params are apparently
        ignored, so I don't see a simpler way to (1) center the text
vertically in a large
        row and (2) make the background highlight fill the entire row. -->
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/
android"
        android:layout_width="wrap_content"
android:layout_height="wrap_content"
        android:background="@android:drawable/menuitem_background"
        android:focusable="true"
android:descendantFocusability="blocksDescendants">
        <FrameLayout android:layout_width="99999dip"
android:layout_height="50dip">
                        <TextView android:text="List header view"
                                
android:textAppearance="?android:attr/textAppearanceLarge"
                                android:layout_gravity="center_vertical"
                                android:layout_width="wrap_content"
android:layout_height="wrap_content"
                                android:paddingLeft="10dip"></TextView>
        </FrameLayout>
</FrameLayout>

////////// list_row.xml //////////

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout android:id="@+id/RelativeLayout01"
        xmlns:android="http://schemas.android.com/apk/res/android"
android:clickable="true"
        android:focusable="true" android:background="@drawable/
android:menuitem_background"
        android:layout_width="fill_parent"
android:layout_height="wrap_content"
        android:descendantFocusability="blocksDescendants">
                <CheckBox android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
                        android:layout_width="wrap_content"
android:layout_height="wrap_content"
                        android:id="@+id/CheckBox01" 
android:layout_marginTop="1dip"
                        android:layout_marginRight="2.5dip"
android:layout_marginLeft="1dip"></CheckBox>
                <TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
                        android:layout_alignParentTop="true" 
android:id="@+id/TextView01"
                        android:text="Top left" android:textStyle="bold"
                        android:layout_toRightOf="@+id/CheckBox01"
android:layout_marginTop="5dip"
                        android:focusable="false"></TextView>
                <TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
                        android:text="Bottom left" 
android:layout_alignLeft="@+id/
TextView01"
                        android:id="@+id/TextView02" android:focusable="false"
                        android:layout_below="@+id/TextView01"></TextView>
                <TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
                        android:text="Top right" 
android:layout_alignParentTop="true"
                        android:layout_alignParentRight="true" 
android:id="@+id/TextView03"
                        android:textStyle="bold" 
android:layout_marginRight="5dip"
                        android:layout_marginTop="5dip" 
android:focusable="false"></
TextView>
                <TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
                        android:text="Bottom right" android:id="@+id/TextView04"
                        android:layout_below="@+id/TextView03" 
android:layout_alignRight="@
+id/TextView03"
                        android:focusable="false"></TextView>
</RelativeLayout>

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Is it possible to stream a very large mp3 using MediaPlayer? The mp3 I
am interested in is over 270 mb.

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