根据页面edittext的内容控制按钮可点击状态

<pre name="code" class="html">这个demo很简单，就不多说了，直接上代码

这是activity_main的代码

<?xml version="1.0" encoding="utf-8"?>
<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="match_parent"
android:orientation="vertical"
tools:context="com.example.testbutton.MainActivity">

<android.support.design.widget.TextInputLayout
android:id="@+id/phone_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp">

<AutoCompleteTextView
android:id="@+id/tv_account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="手机号"
android:inputType="number"
android:maxLength="11"
android:numeric="integer"
android:textSize="16sp" />

</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
android:id="@+id/login_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/phone_number"
android:layout_marginTop="8dp">

<EditText
android:id="@+id/tv_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="密码"
android:imeActionId="@+id/login"
android:imeActionLabel="登录"
android:imeOptions="actionUnspecified"
android:inputType="textPassword"
android:textSize="16sp" />
</android.support.design.widget.TextInputLayout>

<Button
android:id="@+id/btn_sign_in"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/login_password"
android:layout_marginTop="24dp"
android:height="36dp"
android:background="@drawable/button_activity"
android:enabled="false"
android:text="登录"
android:textColor="#ffffff"
android:textSize="16sp"
android:textStyle="bold" />

</LinearLayout>

这是按钮样式的XML

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_pressed="true"><shape><solid android:color="#888888" /><stroke android:width="2dp" android:color="#999999" /><corners android:radius="15dp" /></shape&g4000t;</item><item android:state_enabled="false"><shape><stroke android:width="2dp" /><solid android:color="#f0f0f0" /><corners android:radius="15dp" /><padding android:bottom="5dp" android:left="20dp" android:right="20dp" android:top="5dp" /></shape></item><item><shape><stroke android:width="2dp" /><solid android:color="#f0f" /><corners android:radius="15dp" /><padding android:bottom="5dp" android:left="20dp" android:right="20dp" android:top="5dp" /></shape></item></selector>

public class MainActivity extends AppCompatActivity implements TextWatcher {AutoCompleteTextView ed1;EditText ed2;Button okBtn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ed1 = (AutoCompleteTextView) findViewById(R.id.tv_account);ed2 = (EditText) findViewById(R.id.tv_password);okBtn = (Button) findViewById(R.id.btn_sign_in);ed1.addTextChangedListener(this);ed2.addTextChangedListener(this);}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {}@Overridepublic void afterTextChanged(Editable s) {if (!TextUtils.isEmpty(ed1.getText().toString()) && TextUtils.isEmpty(ed2.getText().toString())) {okBtn.setEnabled(false);} else {okBtn.setEnabled(true);}}}