处理 InputMethodManager 内存泄露的正确姿势

当 MainActivity 被关闭时没有正确的被回收，查看了下内存，因为被 InputMethodManager 引用了，简直莫名其妙，根本没有使用到这货。



原因及解决方案见此Android Memory Leaks InputMethodManager Solved

创建一个启动后就关闭的 Activity

package com.memory.test;

import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

/**
* Created by amitshekhar on 06/05/16.
*/
public class DummyActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
finish();
}
}, 500);
}
}

为它创建一个透明的的 style

<resources>
<!-- Customize theme for floating. -->
<style name="AppTheme.Transparent" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
</resources>

声明一下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.memory.test">

<application/>
<activity
android:name=".MainActivity"
android:configChanges="orientation|keyboardHidden"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".DummyActivity"
android:theme="@style/AppTheme.Transparent"
android:screenOrientation="portrait" />
</application>

</manifest>

在 MainAcitivity 结束的时候启动它

// Write this in onBackPress of your MainActivity
public class MainActivity extends AppCompatActivity{

@Override
public void onBackPressed() {
super.onBackPressed();
// This is important : Hack to open a dummy activity for 200-500ms (cannot be noticed by user as it is for 500ms
//  and transparent floating activity and auto finishes)
startActivity(new Intent(this, DummyActivity.class));
finish();
}

}