The import android provider.ContactsContract cannot be resolved

原因是例子里面用的是android1.5,里面没有android provider.ContactsContract包

1、在文件default.properties 里修改target的值为target=android-8
2、在androidmanifest.xml改sdk的版本为8,即<uses-sdk android:minSdkVersion="8" />

package com.example.kongjian; import androidx.appcompat.app.AppCompatActivity; import androidx.core.view.ViewCompat; import android.annotation.SuppressLint; import android.graphics.Insets; import android.os.Bundle; import android.provider.ContactsContract; import android.view.View; import android.view.Window; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.time.Instant; public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private EditText editText; private Button btn1; private TextView textView; private Button btn2; private Button btn3; @SuppressLint("WrongViewCast") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EdgeT editText=findViewById(R.id.j_b); textView=findViewById(R.id.t_b); btn1=findViewById(R.id.t_a); btn2=findViewById(R.id.t_c); btn3=findViewById(R.id.t_d); btn1.setOnClickListener(this); btn2.setOnClickListener(this); btn3.setOnClickListener(this); ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.),((v, insets) -> { Insets systemBars=insets.getInsets(Window); v.setPadding(systemBars.left,systemBars.top,systemBars.right,systemBars.bottom); return insets; })); } @Override public void onClick(View v){ Button btn=(Button)v; if (btn.getId()==R.id.t_a){Toast.makeText(MainActivity.this,"按钮1被点击了",Toast.LENGTH_LONG).show();} else if(btn.getId()==R.id.t_c){Toast.makeText(MainActivity.this,"按钮2被点击了",Toast.LENGTH_LONG).show();} else{Toast.makeText(MainActivity.this,"按钮3被点击了",Toast.LENGTH_LONG).show();} } }
最新发布
03-18
package com.example.kongjian; import androidx.appcompat.app.AppCompatActivity; import androidx.core.view.ViewCompat; import android.annotation.SuppressLint; import android.graphics.Insets; import android.os.Bundle; import android.provider.ContactsContract; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.time.Instant; public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private EditText editText; private Button btn1; private TextView textView; private Button btn2; private Button btn3; @SuppressLint("WrongViewCast") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editText=findViewById(R.id.j_b); textView=findViewById(R.id.t_b); btn1=findViewById(R.id.t_a); btn2=findViewById(R.id.t_c); btn3=findViewById(R.id.t_d) btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this,"按钮被点击了",Toast.LENGTH_LONG).show(); } }); btn1.setOnClickListener(this); btn2.setOnClickListener(this); btn3.setOnClickListener(this); ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.),((v, insets) -> { Insets systemBars=insets.getInsets(wind) })); } @Override public void onClick(View v){ Button btn=(Button)v; if (btn.getId()==R.id.btn1){Toast.makeText(MainActivity.this,"按钮被点击了",Toast.LENGTH_LONG).show();} else if(btn.getId()==R.id.btn2){Toast.makeText(MainActivity.this,"按钮被点击了",Toast.LENGTH_LONG).show();} else{Toast.makeText(MainActivity.this,"按钮被点击了",Toast.LENGTH_LONG).show();} } }
03-18
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值