开发家庭记账本APP——进度五

给返回图标进行点击事件，而后效果是点击返回图标时，可以返回到主界面

AddActivity.java

public class AddActivity extends AppCompatActivity {
    //返回按钮
    private ImageView mBack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add);
        //返回
        mBack=findViewById(R.id.back);
        mBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(AddActivity.this,"返回成功",Toast.LENGTH_SHORT).show();
                Intent intent=null;
                //返回主页
                intent=new Intent(AddActivity.this,MainActivity.class);
                startActivity(intent);
            }
        });

    }

}