public class MainActivity extends Activity {
	String PASS = "myPassWord.txt";
	Button addbtn, readbtn, modifybtn, savebtn;
	EditText addet, modifyet;
	TextView tv;
	ScrollView sv;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		findViews();

		addbtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				
				Write();
				Toast.makeText(MainActivity.this, "新增成功！", 3000).show();
			}

		});

		readbtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				Toast.makeText(MainActivity.this, "查询成功！", 3000).show();
				Read();

			}
		});

		
		

	}

	public void Write() {// 增
		String pass = addet.getText().toString();
		try {
			FileOutputStream fos = openFileOutput(PASS, MODE_APPEND);
			try {
				fos.write(pass.getBytes());
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				fos.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			addet.setText("");
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void Read() {// 查
		FileInputStream fis;
		InputStreamReader isr;
		BufferedReader br;
		try {
			fis = openFileInput(PASS);
			isr = new InputStreamReader(fis);
			br = new BufferedReader(isr);
			String s = "";
			StringBuffer sb = new StringBuffer();

			try {
				while ((s = br.readLine()) != null) {
					sb.append(s + "\n");
				}
			} catch (IOException e) {
				
				e.printStackTrace();
			}
			tv.setText(sb);
			try {
				fis.close();
			} catch (IOException e) {
				
				e.printStackTrace();
			}
			try {
				isr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				br.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public void findViews() {
		addbtn = (Button) findViewById(R.id.button1);
		readbtn = (Button) findViewById(R.id.button2);
		addet = (EditText) findViewById(R.id.editText1);
		sv = (ScrollView) findViewById(R.id.scrollView1);
		tv = (TextView) findViewById(R.id.textView1);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}


///////////////////////////////////////////////////////////////

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_marginLeft="5dp"
    android:layout_marginTop="5dp"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请在此输入 亲友生日，重要记念日，等重大事件" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="新增" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查询全部" />

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="20dp" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>