startActivityForResult Example

startActivityForResult example in android

string.xml

<?xml version="1.0"encoding="utf-8"?>

<string name="app_name">startActivityForResult</string>

<string name="action_settings">Settings</string>

<string name="button_startactivity">Select Language</string>

<string name="radio_dotnet">DOTNET</string>

<string name="radio_oracle">Android</string>

<string name="textview_language">you are interested in</string>

<string name="button_first">Submit</string>

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity" >

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="47dp"

android:text="@string/button_startactivity" />

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/button1"

android:layout_marginTop="66dp"

android:layout_toLeftOf="@+id/button1"

android:text="@string/textview_language" />

</RelativeLayout>

MainActivity.java:

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

Button button;

TextView textView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

textView=(TextView)findViewById(R.id.textView1);

button=(Button)findViewById(R.id.button1);

button.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent1=new Intent(getApplicationContext(),FirstActivity.class);

startActivityForResult(intent1,100);

}

});

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if(RESULT_OK==resultCode){

if(requestCode==100){

String language=data.getStringExtra("name");

textView.append(language);

}

activity_first.xml

<?xml version="1.0"encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<RadioGroup

android:id="@+id/radioGroup1"

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<RadioButton

android:id="@+id/radio_java"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/radio_JAVA" />

<RadioButton

android:id="@+id/radio_dotnet"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/radio_dotnet" />

<Radio Button

android:id="@+id/radio_oracle"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/radio_oracle" />

</RadioGroup></LinearLayout>

FirstActivity.java

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.Button;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

public class FirstActivity extends Activity{

RadioButton radioButton;

RadioGroup group;

Button button2;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_first);

group=(RadioGroup)findViewById(R.id.radioGroup1);

group.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

// TODO Auto-generated method stub

radioButton=(RadioButton)findViewById(group.getCheckedRadioButtonId());

String radio = radioButton.getText().toString();

Intent intent=new Intent(getApplicationContext(),MainActivity.class);

intent.putExtra("name",radio);

setResult(RESULT_OK,intent);

finish();

}

});

}

AndroidManifest.xml

<? xml version="1.0"encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.swamys.startActivityForResult"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="17" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.swamy.startactivityForResult.MainActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Android Tutorial: Use LeakCanary to detect memory leaks

Overview The memory leak can be a headache to detect and to resolve, small memory leaks can be hidden and may be seen after a long usage of the application and hunting memory leaks is not a simple task. In this tutorial we will create a leaked application and we will use the LeakCanary library to detect the memory leak. Step 1: add the LeakCanary dependency to the application Modify the app/build.gradle to add the LeakCanary dependency as follows: Step 2: Extend and configure the Application class We need to call LeakCanary.install in onCreate method: Step 3: Create a leaked activity For this we will create a singleton class that saves the context: Then, the main activity (leaked one), will use the singleton and then we'll go to a new activity: Then, in the new activity we'll call System.gc to force the garbage collector in order to accelerate the analysis. Step 4: Retrieve the analysis result A nice notification can be shown: The result can be retrieved from logcat: Source c...

Baca selengkapnya

Android Tutorial 91

Cari Blog Ini