import。。。省略了什么？
public class MainActivity extends AppCompatActivity {上面那個(gè)
我 ??import android.support.v4.app.AppCompatActivity; ? ? v4、v7都不行
寶慕林2571938
2019-06-27
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2019-07-10
package?com.genew.irrigation.setting; import?android.support.v7.app.AppCompatActivity; import?android.os.Bundle; import?com.genew.irrigation.R; public?class?MainActivity?extends?AppCompatActivity?{ ????@Override ????protected?void?onCreate(Bundle?savedInstanceState)?{ ????????super.onCreate(savedInstanceState); ????????setContentView(R.layout.activity_main); ????} }