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示範

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
</android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity  {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent it=new Intent();
        it.setAction(Intent.ACTION_VIEW);
        Uri uri=Uri.parse("http://yahoo.com.tw");
        it.setData(uri);
        startActivity(it);
    }
}

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[Android] Android 程式設計教學

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