目的：打开文件，查看文件内容，情况内容，追加内容。
1.创建android project
2.activity内容：
package com.android;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.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.TextView;import android.widget.Toast;public class Activity12 extends Activity implements OnClickListener{ private EditText inputEt;//编辑框 private Button saveBtn;//保存 按钮 private String input_text;//输入的字符串 private OutputStream os; private TextView showText; //显示读取的内容 private Button openTxtBtn; //open file button private Button cleanTxtBtn;//clean file private String text_output; private InputStream is; private byte[] b; private final String FILE = "filetext.txt"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.show); } /** * 设置显示view * @param layoutId */ private void setLayout(int layoutId) { setContentView(layoutId); } /** * 各种布局下，得到view * @param mainOpen */ private void initUI(String mainOpen) { if (mainOpen.equals("main")) { inputEt = (EditText)findViewById(R.id.edit_txt); saveBtn = (Button)findViewById(R.id.save); } else if (mainOpen.equals("open")) { showText = (TextView)findViewById(R.id.showTxt); openTxtBtn = (Button)findViewById(R.id.openTxtB); cleanTxtBtn = (Button)findViewById(R.id.cleanBtn); } } /** * 不同布局下添加自己的Event * @param str */ private void addEvent(String str) { if (str.equals("main")) { saveBtn.setOnClickListener(this); } else if (str.equals("open")) { openTxtBtn.setOnClickListener(this); cleanTxtBtn.setOnClickListener(this); } } /* (non-Javadoc) * @see android.view.View.OnClickListener#onClick(android.view.View) */ @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.save:{ input_text = inputEt.getText().toString(); try { os = this.openFileOutput(FILE, MODE_PRIVATE); os.write(input_text.getBytes()); } catch(FileNotFoundException e) { toast(getString(R.string.fileCloseError) + e); } catch(IOException e) { toast("文件写入失败" + e); } finally { try { os.close(); } catch(Exception e) { toast(getString(R.string.fileCloseError) + e); } } inputEt.setText(""); toast("文件保存成功!!!查看请点击Menu"); } break; case R.id.openTxtB: { toast("文件打开"); try { is = this.openFileInput(FILE); //is = getResources().openRawResource(R.raw.filetext); b = new byte[1024]; int length = is.read(b); text_output = new String(b); setTitle("文件字数 " + length); showText.setText(text_output); } catch(FileNotFoundException e) { toast("文件打开失败" + e); } catch(IOException e) { toast("文件读取失败" + e); } finally { try { is.close(); } catch(Exception e) { toast(getString(R.string.fileCloseError) + e); } } } break; case R.id.cleanBtn: { showText.setText(""); toast(getString(R.string.clean)); } break; default: break; } } /* 增加menu * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu) */ @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.add(0, 1, 1, "Edit").setIcon(R.drawable.edit); menu.add(0, 2, 2, "Open").setIcon(R.drawable.open); menu.add(0, 3, 3, "Exit").setIcon(R.drawable.exit); return super.onCreateOptionsMenu(menu); } /* 点击menu item * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem) */ @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case 1: setLayout(R.layout.main); initUI("main"); addEvent("main"); setTitle("请输入追加的内容："); toast("编辑文件"); break; case 2: setLayout(R.layout.open); initUI("open"); addEvent("open"); toast("打开文件"); break; case 3: finish(); toast("Byebye"); break; default: break; } return super.onOptionsItemSelected(item); } /** * 提示 * @param str 内容 */ private void toast(String str) { Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); } }? 3.布局文件
main.xml 追加文件内容填写页，一个editText 一个button
<?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" android:background="@color/hui" ><EditText android:id="@+id/edit_txt" android:layout_width="350px" android:layout_height="350px" /><Button android:layout_height="wrap_content" android:id="@+id/save" android:text="保存" android:layout_width="80px"/></LinearLayout>
?show.xml 首页
<?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" android:background="@color/hui" > <TextView android:id="@+id/ss" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="30px" android:text="粗糙文件编辑,请点击Menu" /></LinearLayout>
? open.xml 操作文件
<?xml version="1.0" encoding="utf-8"?><AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/openlayout" android:background="@color/hui" ><TextView android:id="@+id/showTxt" android:layout_width="314px" android:layout_height="373px" android:layout_x="3px" android:layout_y="3px" /><Button android:layout_height="wrap_content" android:id="@+id/openTxtB" android:text="打开" android:layout_width="80px" android:layout_x="2px" android:layout_y="378px"/><Button android:layout_height="wrap_content" android:id="@+id/cleanBtn" android:text="清空" android:layout_width="80px" android:layout_x="239px" android:layout_y="378px"/></AbsoluteLayout>
?4.string.xml
<?xml version="1.0" encoding="utf-8"?><resources> <string name="app_name">12</string> <string name="fileCloseError">文件关闭失败</string> <string name="clean">清空</string> <color name = "hui">#FFFACD</color></resources>
?结果：
首页
?点menu
点open
点edit
点exit
?
明天继续完善。美化。。。。
byebye!!!
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