android 文件的读取与写入以及TextView的滚动

package training.android.com;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ScrollView;import android.widget.TextView;import android.widget.Toast;public class fileWriteRead extends Activity implements OnClickListener {/** Called when the activity is first created. */private EditText edit_Text;// 编缉文本框private Button btn_Save;// 保相聚按钮private String text_of_input;// 输入文本值private OutputStream os;// 输出流private TextView showMyText;// 显示文本private Button btnOpenText, btnCleanText;// 打开与清空按钮事件private Button btnOpenRaw;private String Text_of_output;// 输入出文本private InputStream is;// 输入流private InputStream iputRaw;//静态文件流private byte[] b;private ScrollView scroll;private int ori=0;/** * 页面的初始化 * */@Overridepublic void onCreate(Bundle savedInstanceState) {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 * * @param layoutName */private void showLayout(String layoutName) {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 * * @param uiName * 创建人：周昕 &&&&&&&& 创建时间：2010-4-8 */private void UIinit(String uiName) {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 * * @param pageName * 创建人：周昕******** 创建时间：2010-4-8 */private void Logic(String pageName) {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 * * @param strTitle */private void NoteDebug(String strTitle) {Toast.makeText(this, strTitle, Toast.LENGTH_SHORT).show();}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.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 (FileNotFoundException e) {NoteDebug("文件关闭失败" + e);} catch (IOException e) {NoteDebug("文件写入失败" + e);} finally {try {os.close();} catch (IOException e) {NoteDebug("关闭文件失败" + e);}}edit_Text.setText("");break;case R.id.Button_openTxt:NoteDebug("打开文件");try {is = this.openFileInput("txtME");b = new byte[1024];int length = is.read(b);Text_of_output = new String(b);setTitle("文件字数" + length);showMyText.setText(Text_of_output);} catch (FileNotFoundException e) {NoteDebug("文件打开失败" + e);} catch (IOException e) {// TODO Auto-generated catch blockNoteDebug("文件读取失败" + e);} finally {try {is.close();} catch (IOException e) {NoteDebug("文件关闭失败" + e);}}break;case R.id.Button_openRaw:NoteDebug("打开静态文件");try {iputRaw = this.getResources().openRawResource(R.raw.filetext);b = new byte[102400];int length = iputRaw.read(b);Text_of_output="";Text_of_output = new String(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 (FileNotFoundException e) {NoteDebug("静态文件打开失败" + e);} catch (IOException e) {// TODO Auto-generated catch blockNoteDebug("静态文件读取失败" + e);} finally {try {iputRaw.close();} catch (IOException e) {NoteDebug("静态文件关闭失败" + e);}}break;case R.id.Button_clean:NoteDebug("清空文件");showMyText.setText("");NoteDebug("清空");break;}}public boolean onCreateOptionsMenu(Menu menu) {menu.add(0, 1, 1, "edit");menu.add(0, 2, 2, "open");menu.add(0, 3, 3, "clear");return super.onCreateOptionsMenu(menu);}public boolean onOptionsItemSelected(MenuItem items) {switch (items.getItemId()) {case 1:showLayout("main");UIinit("main");Logic("main");NoteDebug("编缉文件");break;case 2:showLayout("openfile");UIinit("openfile");Logic("openfile");NoteDebug("打开件");break;case 3:showLayout("openfile");UIinit("openfile");Logic("openfile");NoteDebug("清空文件");break;}return super.onOptionsItemSelected(items);} private Handler message = new Handler(){ public void handleMessage(Message msg) { doScrow();}}; public class TimerLoop implements Runnable {@Overridepublic void run() {// TODO Auto-generated method stubwhile(true){loop(500);message.sendEmptyMessage(0);}} } //因为sleep()似乎不好用所以采用这种方法计时 public void loop(long i){ long j = i; while(j>0){ j = j-1;} } public boolean onKeyDown(int keyCode, KeyEvent msg){// Thread loop = new Thread(new TimerLoop());// loop.start(); return super.onKeyDown(keyCode, msg);} public void doScrow(){ int now = scroll.getScrollY(); if(ori == now){ scroll.scrollTo(now, 0); ori = -1; } else { scroll.smoothScrollBy(10, 10); ori = now; } }}

main.xml文件

<?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" ><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

<?xml version="1.0" encoding="UTF-8"?><AbsoluteLayout android:id="@+id/openlayout"android:layout_width="fill_parent" android:layout_height="fill_parent"xmlns:android="http://schemas.android.com/apk/res/android"> <ScrollView android:id="@+id/scroll"android:layout_width="fill_parent" android:layout_height="300dip" ><LinearLayout android:layout_width="fill_parent"android:layout_height="380px"><TextView android: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><Button android: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><Button android: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><Button android: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

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

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