startActivity

gistfile1.java

package startnineyi.com.startnineyi;

import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;


public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(isInstallShopApp()){
                    openApp();
                }else{
                    openApp();
                }
            }
        });

        final EditText txt = (EditText)findViewById(R.id.textview);
        findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(txt.getText() != null) {
                    Uri otherShopUri = Uri.parse(txt.getText().toString());
                    if (otherShopUri == null || otherShopUri.getPath() == null) {
                        return;
                    }
                    Intent intent=getPackageManager().getLaunchIntentForPackage("com.nineyi.shop.s000360");
                    intent.setData(otherShopUri);
                    startActivity(intent);
                }
            }
        });


    }

    private boolean isInstallShopApp() {
        PackageInfo packageInfo;
        try {
            packageInfo = getPackageManager().getPackageInfo("com.nineyi.shop.s000360", PackageManager.GET_ACTIVITIES);
        } catch (PackageManager.NameNotFoundException e) {
            packageInfo = null;
            e.printStackTrace();
        }
        return packageInfo != null;
    }

    public void openApp(){
        if(isInstallShopApp()){
            openShopApp();
        }else{
            openGooglePlay();
        }
    }


    public void openShopApp(){
        Intent intent=getPackageManager().getLaunchIntentForPackage("com.nineyi.shop.s000360");
        startActivity(intent);
    }

    public void openGooglePlay(){
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        intent.setData(Uri.parse("market://details?id=com.nineyi.shop.s000360"));
        startActivity(intent);
    }




}