TextView 部分字符高亮 android

[功能]

TextView是不支持部分字段高亮的但是我们可以进行扩展

[思路]

1. 利用LinearLayout 作为 TextView 的容器

2. 字符串中每个字都使用一个TextView显示之

3. 还可以使用*.9.png来作为所有TextView的背景使之看上去成为整体

[思路步骤]

TextHighlightHelper.java

public class TextHighlightHelper {

Activity activity;

LinearLayout lLayout;

public TextHighlightHelper(Activity a,int l){
activity = a;

lLayout = new LinearLayout(activity);
lLayout.setOrientation(l);
lLayout.setLayoutParams(
new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));
}

public void addText(CharSequence cs){
for(int i=0;i<cs.length();i++){
TextView tv = new TextView(activity);
tv.setText(cs.charAt(i)+"");

lLayout.addView(tv);
}
}

public void addColor(int s,int l,int c){
if(l > lLayout.getChildCount()){
//error argument
}
else {
for(int i=s;i<s+l;i++){
TextView item = (TextView)lLayout.getChildAt(i);

item.setTextColor(c);
}
}
}

public void addBackResource(int r){
lLayout.setBackgroundResource(r);
}

public View loadView(){
return lLayout;
}
}

public class TextHighlightHelper{Activity activity;LinearLayout lLayout;public TextHighlightHelper(Activity a,int l){activity = a;lLayout = new LinearLayout(activity);lLayout.setOrientation(l);lLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));}}

TextHighlightUsage.java

public class TextHighlightUsage extends Activity{

TextHighlightHelper tHelper1;
TextHighlightHelper tHelper2;

LinearLayout ll;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.txt_high_light);

ll = (LinearLayout)findViewById(R.id.layout);

//Text:HelloText2
CharSequence c1 = "HelloText2";
tHelper1 = new TextHighlightHelper(this,LinearLayout.HORIZONTAL);
tHelper1.addText(c1);
tHelper1.addColor(0, 3, Color.RED);
tHelper1.addBackResource(R.drawable.icon);

ll.addView(tHelper1.loadView());

//Text:创新源于模仿!
CharSequence c2 = "创新源于模仿!";
tHelper2 = new TextHighlightHelper(this,LinearLayout.VERTICAL);
tHelper2.addText(c2);
tHelper2.addColor(1, 3, Color.RED);

ll.addView(tHelper2.loadView());

TextView tv = new TextView(this);
tv.setText(Html.fromHtml("<font color=/"#ff0000/">红色</font>其它颜色"));
ll.addView(tv);

}
}

txt_high_light.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:id="@+id/layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:text="HelloText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>

7. emulator 运行截图：

From:http://griffinshi.javaeye.com/blog/604444

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