来源: 互联网  发布时间: 2014-02-18

拖动按钮到处跑
1. 布局文件
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<?xml
version="1.0"
encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/btn_hello"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><Button android:id="@+id/btn_hello" android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="@string/hello" /></LinearLayout>2. 代码
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package com.roiding.sample;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;

public
class Touch extends Activity {
/** Called when the activity is first created. */
@Override
public
void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

final Button btn = (Button) findViewById(R.id.btn_hello);

btn.setOnTouchListener(new OnTouchListener() {
int[] temp = new
int[] { 0, 0 };

public
boolean onTouch(View v, MotionEvent event) {

int eventaction = event.getAction();
Log.i("&&&", "onTouchEvent:" + eventaction);

int x = (int) event.getRawX();
int y = (int) event.getRawY();

switch (eventaction) {

case MotionEvent.ACTION_DOWN: // touch down so check if the
temp[0] = (int) event.getX();
temp[1] = y - v.getTop();
break;

case MotionEvent.ACTION_MOVE: // touch drag with the ball
v.layout(x - temp[0], y - temp[1], x + v.getWidth()
- temp[0], y - temp[1] + v.getHeight());

v.postInvalidate();
break;

case MotionEvent.ACTION_UP:
break;
}

return
false;
}

});

}
}

    

    来源: 互联网  发布时间: 2014-02-18

设置ScrollView滚动条的颜色
很多开发者在做Android UI时不知道如何设置ScrollView滚动条控件的滑块颜色，其实通过ScrollView的xml布局属性android:scrollbarThumbVertical可以关联一个drawable对象，比如说在ScrollView中我们有

  android:scrollbars="vertical"   //滚动条是垂直的
  android:scrollbarThumbVertical="@drawable/red"  //垂直滚动条颜色为red，red可以是一个png的图片或用shape组成的xml图形文件组成的drawable对象。

    

    来源: 互联网  发布时间: 2014-02-18

加载远程图片到 View

NSURL *url=[NSURL URLWithString:@"http://..../Icons/icon.ico"];
NSData *data=[NSData dataWithContentsOfURL:url];
UIImage *tmpimage=[[UIImage alloc] initWithData:data];

UIImageView *imageview =[[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
imageview.image=tmpimage;
[self.view addSubview:imageview];