How can i get the build number of my android app?

This question already has an answer here:

How to get the build/version number of your Android application? 23 answers

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简单而简短的方式：实施到您的活动中

String versionName = getApplicationContext().getPackageManager()
.getPackageInfo(getApplicationContext().getPackageName(), 0).versionName;
TextView tv=(TextView)findViewById(R.id.tv); 
tv.setText(versionName);

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