Android动态显示隐藏密码输入框的内容

通过设置EditText的setTransformationMethod()方法来实现隐藏密码或这显示密码，示例如下：

	private Button mBtnPassword;
	private EditText mEtPassword;
	private boolean mbDisplayFlg = false;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mEtPassword = (EditText)findViewById(R.id.password);
        mBtnPassword = (Button)findViewById(R.id.btnPassword);
        mBtnPassword.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Log.d("AndroidTest", "mbDisplayFlg = " + mbDisplayFlg);
				if (!mbDisplayFlg) {
					// display password text, for example "123456"
					mEtPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
				} else {
					// hide password, display "."
					mEtPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
				}
				mbDisplayFlg = !mbDisplayFlg;
				mEtPassword.postInvalidate();
			}
        	
        });
       
    }

main.xml

<?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">
	<Button android:id="@+id/btnPassword"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="密码" />
	<EditText android:id="@+id/password"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:password="true"
		android:textSize="18sp"
		android:text="123456">
	</EditText>
</LinearLayout>