Android檔案讀取簡單操作

標籤：

 1 public class MainActivity extends ActionBarActivity { 2      3     final String FILE_NAME = "crazyit.bin"; 4     @Override 5     protected void onCreate(Bundle savedInstanceState) { 6         super.onCreate(savedInstanceState); 7         setContentView(R.layout.activity_main); 8          9         10         System.out.println(new StringBuilder("a").append("b").append("c").toString());11         12         Button read = (Button) findViewById(R.id.read);13         Button write = (Button) findViewById(R.id.write);14         15         16         final EditText edit1 = (EditText) findViewById(R.id.edit1);17         final EditText edit2 = (EditText) findViewById(R.id.edit2);18         19         write.setOnClickListener(new OnClickListener() {20             21             public void onClick(View v) {22                 write(edit1.getText().toString());23                 edit1.setText("");24             }25         });26         27         read.setOnClickListener(new OnClickListener() {28             29             public void onClick(View v) {30                 edit2.setText(read());31             }32         });33         34     }35     36     public void write(String content){37         try {38             FileOutputStream fos = openFileOutput(FILE_NAME, MODE_APPEND);39             PrintStream ps = new PrintStream(fos);40             ps.println(content);41             ps.close();42             43         } catch (FileNotFoundException e) {44             e.printStackTrace();45         }46         47     }48     49     public String read(){50         try {51             FileInputStream fis = openFileInput(FILE_NAME);52             byte [] buff = new byte[1024];53             int hasRead = 0;54             StringBuilder builder = new StringBuilder("");55             while ( (hasRead = fis.read(buff)) > 0 ) {56                 builder.append(new String(buff, 0, hasRead));57             }58             fis.close();59             return builder.toString();60             61         } catch (FileNotFoundException e) {62             e.printStackTrace();63         } catch (IOException e) {64             e.printStackTrace();65         }66         67         return null;68         69

xml布局檔案如下：<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Button        android:id="@+id/read"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Read" />    <Button        android:id="@+id/write"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Write" />    <EditText        android:id="@+id/edit1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:ems="10" >        <requestFocus />    </EditText>    <EditText        android:id="@+id/edit2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:ems="10" /></LinearLayout>

 

70 }

 

Android檔案讀取簡單操作