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I decided to spend a few hours on Stetho.
Stetho is a sophisticated debug bridge for Android applications.
How to enable it
It is very simple to enable Stetho.
Just add these lines to your build.gradle:
dependencies {
// Stetho core
compile ‘com.facebook.stetho:stetho:1.1.1‘
//If you want to add a network helper
compile ‘com.facebook.stetho:stetho-okhttp:1.1.1‘
}
Then in your Application you can enable the tool just adding:
Stetho.initialize(
Stetho.newInitializerBuilder(this)
.enableDumpapp(
Stetho.defaultDumperPluginsProvider(this))
.enableWebKitInspector(
Stetho.defaultInspectorModulesProvider(this))
.build());
In my simple application, I have a network call with okhttp-client , a simple value in the shared preferences, and a small db with one table.
Now the last step: Run the application and just open Chrome on your pc (where the device is plugged).
In your chrome just navigate on chrome://inspect 
As you can see in the image you can see 2 apps running in my device (I love Nexus4 for this kind of tests....)
How can I use it
Here you can open a magical world...clicking the inspect link.
First of all you can see the elements tab.
Here you can navigate in the elements inside your Activity......
Here a first surprise...clicking on the entry on the tab, the element is highlighted on the device !
The network tab.
If you work with the Chrome Developer Tools, you know it very well. Here you can see the network calls with their data.
In my app I do a simple call with okhttp
OkHttpClient client = new OkHttpClient();
client.networkInterceptors().add(new StethoInterceptor());
Request request = new Request.Builder()
.url("https://google.com")
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Request request, IOException e) {
//do something
}
@Override
public void onResponse(Response response) throws IOException {
//do something
}
});
Here the tab:
The Resources tab.
In my sample app I am setting a simple value in the SharedPreferences.
SharedPreferences.Editor editor = getSharedPreferences("TEST", MODE_PRIVATE).edit();
editor.putString("name", "Paolo");
editor.putInt("idName", 12);
editor.commit();
You can check this value in the navigating in the Local Storage entry.
Also I use a simple SQLiteOpenHelper to manage a very small database with just a table.
private static final String CREATE_DATABASE = "CREATE TABLE " + TBL_USR + " ( " +
TBL_USR_CLMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, " +
TBL_USR_CLMN_NAME + " TEXT NOT NULL, " +
TBL_USR_CLMN_SURNAME + " TEXT NOT NULL, " +
TBL_USR_CLMN_CODE + " INTEGER NOT NULL DEFAULT 0 " +
")";
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_DATABASE);
db.execSQL("INSERT INTO " + TBL_USR + " " + "("+ TBL_USR_CLMN_NAME +" , " + TBL_USR_CLMN_SURNAME +" , " + TBL_USR_CLMN_CODE +")" + " VALUES(‘PAOLO1‘,‘ROSSI1‘, 233432 )");
db.execSQL("INSERT INTO " + TBL_USR + " " + "("+ TBL_USR_CLMN_NAME +" , " + TBL_USR_CLMN_SURNAME +" , " + TBL_USR_CLMN_CODE +")" + " VALUES(‘PAOLO2‘,‘ROSSI2‘, 103213 )");
db.execSQL("INSERT INTO " + TBL_USR + " " + "("+ TBL_USR_CLMN_NAME +" , " + TBL_USR_CLMN_SURNAME +" , " + TBL_USR_CLMN_CODE +")" + " VALUES(‘PAOLO3‘,‘ROSSI3‘, 5454331 )");
db.execSQL("INSERT INTO " + TBL_USR + " " + "("+ TBL_USR_CLMN_NAME +" , " + TBL_USR_CLMN_SURNAME +" , " + TBL_USR_CLMN_CODE +")" + " VALUES(‘PAOLO4‘,‘ROSSI4‘, 5454444 )");
db.execSQL("INSERT INTO " + TBL_USR + " " + "("+ TBL_USR_CLMN_NAME +" , " + TBL_USR_CLMN_SURNAME +" , " + TBL_USR_CLMN_CODE +")" + " VALUES(‘PAOLO5‘,‘ROSSI5‘, 1231232 )");
db.execSQL("INSERT INTO " + TBL_USR + " " + "("