From cead91974acf5b31e0c9b5e0b71dc55c2c5c0ab8 Mon Sep 17 00:00:00 2001
From: Xiyuan Xia <xiyuan@google.com>
Date: Fri, 15 May 2015 11:01:30 -0700
Subject: [PATCH] No input instead of disabling password entry

So that the keyboard does not come and go all the time.

Bug:21271425
Change-Id: I9ba2fa7034777885a6e53f135eca31fc89568e9d
---
 .../widget/TextViewInputDisabler.java         | 49 +++++++++++++++++++
 .../keyguard/KeyguardPasswordView.java        |  9 +++-
 2 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 core/java/com/android/internal/widget/TextViewInputDisabler.java

diff --git a/core/java/com/android/internal/widget/TextViewInputDisabler.java b/core/java/com/android/internal/widget/TextViewInputDisabler.java
new file mode 100644
index 0000000000000..fb0b3b95b6f2d
--- /dev/null
+++ b/core/java/com/android/internal/widget/TextViewInputDisabler.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.widget;
+
+import android.text.InputFilter;
+import android.text.Spanned;
+import android.widget.TextView;
+
+/**
+ * Helper class to disable input on a TextView. The input is disabled by swapping in an InputFilter
+ * that discards all changes. Use with care if you have customized InputFilter on the target
+ * TextView.
+ */
+public class TextViewInputDisabler {
+    private TextView mTextView;
+    private InputFilter[] mDefaultFilters;
+    private InputFilter[] mNoInputFilters = new InputFilter[] {
+            new InputFilter () {
+                @Override
+                public CharSequence filter(CharSequence source, int start, int end, Spanned dest,
+                        int dstart, int dend) {
+                    return "";
+                }
+            }
+    };
+
+    public TextViewInputDisabler(TextView textView) {
+        mTextView = textView;
+        mDefaultFilters = mTextView.getFilters();
+    }
+
+    public void setInputEnabled(boolean enabled) {
+        mTextView.setFilters(enabled ? mDefaultFilters : mNoInputFilters);
+    }
+}
diff --git a/packages/Keyguard/src/com/android/keyguard/KeyguardPasswordView.java b/packages/Keyguard/src/com/android/keyguard/KeyguardPasswordView.java
index 3fcc3c3180d52..f18c451fe0e0e 100644
--- a/packages/Keyguard/src/com/android/keyguard/KeyguardPasswordView.java
+++ b/packages/Keyguard/src/com/android/keyguard/KeyguardPasswordView.java
@@ -35,6 +35,8 @@ import android.view.inputmethod.InputMethodSubtype;
 import android.widget.TextView;
 import android.widget.TextView.OnEditorActionListener;
 
+import com.android.internal.widget.TextViewInputDisabler;
+
 import java.util.List;
 /**
  * Displays an alphanumeric (latin-1) key entry for the user to enter
@@ -49,6 +51,8 @@ public class KeyguardPasswordView extends KeyguardAbsKeyInputView
 
     InputMethodManager mImm;
     private TextView mPasswordEntry;
+    private TextViewInputDisabler mPasswordEntryDisabler;
+
     private Interpolator mLinearOutSlowInInterpolator;
     private Interpolator mFastOutLinearInInterpolator;
 
@@ -70,7 +74,7 @@ public class KeyguardPasswordView extends KeyguardAbsKeyInputView
 
     protected void resetState() {
         mSecurityMessageDisplay.setMessage(R.string.kg_password_instructions, false);
-        mPasswordEntry.setEnabled(true);
+        setPasswordEntryEnabled(true);
     }
 
     @Override
@@ -123,6 +127,7 @@ public class KeyguardPasswordView extends KeyguardAbsKeyInputView
                 Context.INPUT_METHOD_SERVICE);
 
         mPasswordEntry = (TextView) findViewById(getPasswordTextViewId());
+        mPasswordEntryDisabler = new TextViewInputDisabler(mPasswordEntry);
         mPasswordEntry.setKeyListener(TextKeyListener.getInstance());
         mPasswordEntry.setInputType(InputType.TYPE_CLASS_TEXT
                 | InputType.TYPE_TEXT_VARIATION_PASSWORD);
@@ -185,7 +190,7 @@ public class KeyguardPasswordView extends KeyguardAbsKeyInputView
 
     @Override
     protected void setPasswordEntryEnabled(boolean enabled) {
-        mPasswordEntry.setEnabled(enabled);
+        mPasswordEntryDisabler.setInputEnabled(enabled);
     }
 
     /**