android 文件的读取与写入以及TextView

isiqi

浏览: 16842221 次
性别:
来自: 济南

最近访客更多访客>>

qq85609655

yuxiatongzhi

nison

hellohank

博主相关

博客

微博

相册

留言

关于我

文章分类

社区版块

存档分类

2012-07 ( 335)
2012-06 ( 252)
2012-05 ( 362)
更多存档...

Android OS XML J#

packagetraining.android.com;
importjava.io.FileNotFoundException;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.view.KeyEvent;
importandroid.view.Menu;
importandroid.view.MenuItem;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.ScrollView;
importandroid.widget.TextView;
importandroid.widget.Toast;
publicclassfileWriteReadextendsActivityimplementsOnClickListener{
/**Calledwhentheactivityisfirstcreated.*/
privateEditTextedit_Text;//编缉文本框
privateButtonbtn_Save;//保相聚按钮
privateStringtext_of_input;//输入文本值
privateOutputStreamos;//输出流
privateTextViewshowMyText;//显示文本
privateButtonbtnOpenText,btnCleanText;//打开与清空按钮事件
privateButtonbtnOpenRaw;
privateStringText_of_output;//输入出文本
privateInputStreamis;//输入流
privateInputStreamiputRaw;//静态文件流
privatebyte[]b;
privateScrollViewscroll;
privateintori=0;
/**
*页面的初始化
*
*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
showLayout("main");
UIinit("main");
Logic("main");
}
/**
*通过页面名称去显示各页面信息创建人：周昕创建时间：2010-4-8方法名称：showLayout
*
*@paramlayoutName
*/
privatevoidshowLayout(StringlayoutName){
if(layoutName.equals("main")){
setContentView(R.layout.main);
}
if(layoutName.equals("openfile")){
setContentView(R.layout.openfile);
}
}
/**
*通过页面名称去初始化控件
*
*@paramuiName
*创建人：周昕&&&&&&&&创建时间：2010-4-8
*/
privatevoidUIinit(StringuiName){
if(uiName.equals("main")){
edit_Text=(EditText)findViewById(R.id.Edit_text);
btn_Save=(Button)findViewById(R.id.Button_save);
}
if(uiName.equals("openfile")){
btnOpenText=(Button)findViewById(R.id.Button_openTxt);
btnCleanText=(Button)findViewById(R.id.Button_clean);
btnOpenRaw=(Button)findViewById(R.id.Button_openRaw);
showMyText=(TextView)findViewById(R.id.TextView_showTxt);
}
}
/**
*通过页面名称去对各Button指定事件
*
*@parampageName
*创建人：周昕********创建时间：2010-4-8
*/
privatevoidLogic(StringpageName){
if(pageName.equals("main")){
btn_Save.setOnClickListener(this);
}
if(pageName.equals("openfile")){
btnOpenText.setOnClickListener(this);
btnCleanText.setOnClickListener(this);
btnOpenRaw.setOnClickListener(this);
}
}
/**
*在Toast中显示指定的字段
*
*@paramstrTitle
*/
privatevoidNoteDebug(StringstrTitle){
Toast.makeText(this,strTitle,Toast.LENGTH_SHORT).show();
}
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
switch(v.getId()){
caseR.id.Button_save:
NoteDebug("文件保存");
text_of_input=edit_Text.getText().toString();
try{
os=this.openFileOutput("txtME",MODE_PRIVATE);
os.write(text_of_input.getBytes());
}catch(FileNotFoundExceptione){
NoteDebug("文件关闭失败"+e);
}catch(IOExceptione){
NoteDebug("文件写入失败"+e);
}finally{
try{
os.close();
}catch(IOExceptione){
NoteDebug("关闭文件失败"+e);
}
}
edit_Text.setText("");
break;
caseR.id.Button_openTxt:
NoteDebug("打开文件");
try{
is=this.openFileInput("txtME");
b=newbyte[1024];
intlength=is.read(b);
Text_of_output=newString(b);
setTitle("文件字数"+length);
showMyText.setText(Text_of_output);
}catch(FileNotFoundExceptione){
NoteDebug("文件打开失败"+e);
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
NoteDebug("文件读取失败"+e);
}finally{
try{
is.close();
}catch(IOExceptione){
NoteDebug("文件关闭失败"+e);
}
}
break;
caseR.id.Button_openRaw:
NoteDebug("打开静态文件");
try{
iputRaw=this.getResources().openRawResource(R.raw.filetext);
b=newbyte[102400];
intlength=iputRaw.read(b);
Text_of_output="";
Text_of_output=newString(b);
setTitle("静态文件字数"+length);
showMyText.setText(Text_of_output);
showMyText.setHorizontallyScrolling(true);
scroll=(ScrollView)findViewById(R.id.scroll);
scroll.smoothScrollBy(ori,0);
}catch(FileNotFoundExceptione){
NoteDebug("静态文件打开失败"+e);
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
NoteDebug("静态文件读取失败"+e);
}finally{
try{
iputRaw.close();
}catch(IOExceptione){
NoteDebug("静态文件关闭失败"+e);
}
}
break;
caseR.id.Button_clean:
NoteDebug("清空文件");
showMyText.setText("");
NoteDebug("清空");
break;
}
}
publicbooleanonCreateOptionsMenu(Menumenu){
menu.add(0,1,1,"edit");
menu.add(0,2,2,"open");
menu.add(0,3,3,"clear");
returnsuper.onCreateOptionsMenu(menu);
}
publicbooleanonOptionsItemSelected(MenuItemitems){
switch(items.getItemId()){
case1:
showLayout("main");
UIinit("main");
Logic("main");
NoteDebug("编缉文件");
break;
case2:
showLayout("openfile");
UIinit("openfile");
Logic("openfile");
NoteDebug("打开件");
break;
case3:
showLayout("openfile");
UIinit("openfile");
Logic("openfile");
NoteDebug("清空文件");
break;
}
returnsuper.onOptionsItemSelected(items);
}
privateHandlermessage=newHandler(){
publicvoidhandleMessage(Messagemsg){
doScrow();
}
};
publicclassTimerLoopimplementsRunnable{
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
while(true){
loop(500);
message.sendEmptyMessage(0);
}
}
}
//因为sleep()似乎不好用所以采用这种方法计时
publicvoidloop(longi){
longj=i;
while(j>0){
j=j-1;
}
}
publicbooleanonKeyDown(intkeyCode,KeyEventmsg){
//Threadloop=newThread(newTimerLoop());
//loop.start();
returnsuper.onKeyDown(keyCode,msg);
}
publicvoiddoScrow(){
intnow=scroll.getScrollY();
if(ori==now){
scroll.scrollTo(now,0);
ori=-1;
}
else{
scroll.smoothScrollBy(10,10);
ori=now;
}
}
}

main.xml文件

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText
android:id="@+id/Edit_text"
android:layout_width="fill_parent"
android:layout_height="350px">
</EditText>
<Button
android:text="保存"
android:id="@+id/Button_save"
android:layout_width="80px"
android:layout_height="wrap_content">
</Button>
</LinearLayout>

open.xml

<?xmlversion="1.0"encoding="UTF-8"?>
<AbsoluteLayoutandroid:id="@+id/openlayout"
android:layout_width="fill_parent"android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<!--<ScrollViewandroid:layout_weight="1"android:layout_width="fill_parent"
android:layout_height="wrap_content"android:scrollbars="vertical"
android:fadingEdge="vertical"android:id="@+id/scroll">
-->
<ScrollView
android:id="@+id/scroll"
android:layout_width="fill_parent"
android:layout_height="300dip">
<LinearLayoutandroid:layout_width="fill_parent"
android:layout_height="380px">
<TextViewandroid:id="@+id/TextView_showTxt"
android:layout_width="314px"android:layout_height="373px"
android:scrollbars="vertical"android:fadingEdge="vertical"
android:autoText="true"android:layout_x="3px"android:layout_y="3px"
>
</TextView>
</LinearLayout>
</ScrollView>
<Buttonandroid:id="@+id/Button_openTxt"android:layout_width="80px"
android:layout_height="wrap_content"android:text="打开"
android:layout_x="2px"android:layout_y="378px">
</Button>
<Buttonandroid:id="@+id/Button_openRaw"android:layout_width="80px"
android:layout_height="wrap_content"android:text="静态文件"
android:layout_x="102px"android:layout_y="378px">
</Button>
<Buttonandroid:id="@+id/Button_clean"android:layout_width="80px"
android:layout_height="wrap_content"android:text="清空"
android:layout_x="239px"android:layout_y="378px">
</Button>
</AbsoluteLayout>

AndroidMainfest.xml

<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="training.android.com"android:versionCode="1"
android:versionName="1.0">
<applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
<activityandroid:name=".fileWriteRead"android:label="@string/app_name">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-sdkandroid:minSdkVersion="3"/>
<uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permissionandroid:name="android.permission.MODE_WORLD_READABLE"></uses-permission>
<uses-permissionandroid:name="android.permission.MODE_WORLD_WRITEABLE"></uses-permission>
</manifest>