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【Android】TextView动态设置android:drawableLeft|Right|Top|Bottom,SetColor

2014-06-07 11:23 543 查看
Android中有时需动态设置控件四周的drawble图片,这个时候就需要调用 setCompoundDrawables(left, top, right, bottom),四个参数类型都是drawable

Button继承TextView,所以可以采用相同的设置方法

方法一.XML方式

<TextView
android:id="@+id/bookTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableLeft="@drawable/checkmark"
android:drawableRight="@drawable/checkmark"
android:drawableTop="@drawable/checkmark"
android:gravity="center_vertical"
android:textStyle="bold"
android:textSize="20dip"
android:maxLines="1"
android:ellipsize="end"/>


方法二.JAVA代码

Drawable img_on, img_off;
Resources res = getResources();
img_off = res.getDrawable(R.drawable.btn_strip_mark_off);
//调用setCompoundDrawables时,必须调用Drawable.setBounds()方法,否则图片不显示
img_off.setBounds(0, 0, img_off.getMinimumWidth(), img_off.getMinimumHeight());
btn.setCompoundDrawables(img_off, null, null, null); //设置左图标


android 如何设置背景的透明度

半透明<Button android:background="#e0000000" ... />
透明<Button android:background="#00000000" ... />


颜色和不透明度 (alpha) 值以十六进制表示法表示。任何一种颜色的值范围都是 0 到 255(00 到 ff)。对于 alpha,00 表示完全透明,ff 表示完全不透明。表达式顺序是“aabbggrr”,其中aa=alpha(00 到 ff);bb=blue(00 到 ff);gg=green(00 到 ff);rr=red(00 到 ff)。例如,如果您希望对某叠加层应用不透明度为 50% 的蓝色,则应指定以下值:7fff0000

Java代码

View v = findViewById(R.id.content);//找到你要设透明背景的layout 的id
v.getBackground().setAlpha(100);//0~255透明度值 ,0为完全透明,255为不透明


package com.txlong;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TextView;

public class ListViewDemoActivity extends Activity {
// private ListView listView;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

TextView tv = new TextView(this);
tv.setText("Test set TextView's color.");
//方案一:通过ARGB值的方式
/**
* set the TextView color as the 0~255's ARGB,These component values
* should be [0..255], but there is no range check performed, so if they
* are out of range, the returned color is undefined
*/
//        tv.setTextColor(Color.rgb(255, 255, 255));
/**
* set the TextView color as the #RRGGBB #AARRGGBB 'red', 'blue',
* 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow',
* 'lightgray', 'darkgray'
*/
tv.setTextColor(Color.parseColor("#FFFFFF"));

/** 原来不知道有上边的方法,就用这个笨笨方法了 */
//        String StrColor = null;
//        StrColor = "FFFFFFFF";
//        int length = StrColor.length();
//        if (length == 6) {
//            tv.setTextColor(Color.rgb(
//                    Integer.valueOf(StrColor.substring(0, 2), 16),
//                    Integer.valueOf(StrColor.substring(2, 4), 16),
//                    Integer.valueOf(StrColor.substring(4, 6), 16)));
//        } else if (length == 8) {
//            tv.setTextColor(Color.argb(
//                    Integer.valueOf(StrColor.substring(0, 2), 16),
//                    Integer.valueOf(StrColor.substring(2, 4), 16),
//                    Integer.valueOf(StrColor.substring(4, 6), 16),
//                    Integer.valueOf(StrColor.substring(6, 8), 16)));
//        }

//方案二:通过资源引用
//        tv.setTextColor(getResources().getColor(R.color.my_color));

//方案三:通过资源文件写在String.xml中
//        Resources resource = (Resources) getBaseContext().getResources();
//        ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.my_color);
//        if (csl != null) {
//            tv.setTextColor(csl);
//        }

//方案四:通过xml文件,如/res/text_color.xml
//        XmlPullParser xrp = getResources().getXml(R.color.text_color);
//        try {
//            ColorStateList csl = ColorStateList.createFromXml(getResources(), xrp);
//            tv.setTextColor(csl);
//        } catch (Exception e) {
//        }

// listView = new ListView(this);
//
// Cursor cursor = getContentResolver().query(
// Uri.parse("content://contacts/people"), null, null, null, null);
//
// startManagingCursor(cursor);
//
// ListAdapter listAdapter = new SimpleCursorAdapter(this,
// android.R.layout.simple_expandable_list_item_2, cursor,
// new String[] { "name", "name" }, new int[] {
// android.R.id.text1, android.R.id.text2 });
//
// listView.setAdapter(listAdapter);
// setContentView(listView);
setContentView(tv);
}
}  


String.xml文件为:

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="hello">Hello World, ListViewDemoActivity!</string>
<string name="app_name">ListViewDemo</string>

<color name="my_color">#FFFFFF</color>

</resources>


/res/color/text_color.xml

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

<item android:state_pressed="true" android:color="#FF111111"/>
<!-- pressed -->
<item android:state_focused="true" android:color="#FF222222"/>
<!-- focused -->
<item android:state_selected="true" android:color="#FF333333"/>
<!-- selected -->
<item android:state_active="true" android:color="#FF444444"/>
<!-- active -->
<item android:state_checkable="true" android:color="#FF555555"/>
<!-- checkable -->
<item android:state_checked="true" android:color="#FF666666"/>
<!-- checked -->
<item android:state_enabled="true" android:color="#FF777777"/>
<!-- enabled -->
<item android:state_window_focused="true" android:color="#FF888888"/>
<!-- window_focused -->

</selector>
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