Step 1: Get the apk you want to install.
Step 2: Select the the DDMS option in your Eclipse.
Step 3: Go to File Explorer(Refer the image)
Step 4: With in the File Explorer select Data-->apps. There is a list of application installed in our emulator.
Step 5: Select any one from there.
Step 6: Now, Click the mobile icon(on the Right side of our File Explorer) to push the apk file to Device.
Step 7: Now, select the apk you want to install from your computer.
Step 8: apk will install successfully, now go to your emulator(search the
app now install) there is a application which we install now.