diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml index 7189923..641a64f 100644 --- a/app/src/main/AndroidManifest.xml +++ b/app/src/main/AndroidManifest.xml @@ -10,15 +10,20 @@ android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.ActivityTest6117_1"> - + + + + + + \ No newline at end of file diff --git a/app/src/main/java/com/yanzitong/activitytest6117/FirstActivity.java b/app/src/main/java/com/yanzitong/activitytest6117/FirstActivity.java index 5915681..c309812 100644 --- a/app/src/main/java/com/yanzitong/activitytest6117/FirstActivity.java +++ b/app/src/main/java/com/yanzitong/activitytest6117/FirstActivity.java @@ -1,16 +1,20 @@ package com.yanzitong.activitytest6117; +import android.content.Intent; import android.os.Bundle; import android.util.Log; +import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; +import android.widget.LinearLayout; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; +import androidx.appcompat.widget.PopupMenu; // 组合键：shift + enter public class FirstActivity extends AppCompatActivity { @@ -20,6 +24,9 @@ public class FirstActivity extends AppCompatActivity { // 全局（成员）变量：m开头 Button mFirstBtn1; Button mFirstBtn2; + LinearLayout mFirstLinearLayout; + Button mFirstBtn3; + Button mFirstBtn4; /** * 事件驱动机制 @@ -33,13 +40,40 @@ public class FirstActivity extends AppCompatActivity { super.onCreate(savedInstanceState); setContentView(R.layout.first_layout); Log.d(TAG, "onCreate: 活动创建成功"); // 组合键2：alter + enter + + mFirstBtn4 = findViewById(R.id.first_btn4); + mFirstBtn4.setOnClickListener(v -> { + // Activity之间的跳转——显式Intent + Intent intent = new Intent(FirstActivity.this, SecondActivity.class); + startActivity(intent); + }); + + mFirstBtn3 = findViewById(R.id.first_btn3); + mFirstBtn3.setOnClickListener(v -> { + finish(); + }); + mFirstBtn1 = findViewById(R.id.first_btn1); mFirstBtn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(FirstActivity.this, "6117严梓桐单击了按钮", Toast.LENGTH_SHORT).show(); + PopupMenu popupMenu = new PopupMenu(FirstActivity.this, v); // this, super + popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu()); + popupMenu.setOnMenuItemClickListener(item -> { + if (item.getItemId() == R.id.add_item) { + Toast.makeText(FirstActivity.this, "单击了add按钮", Toast.LENGTH_SHORT).show(); + } else if (item.getItemId() == R.id.modify_item) { + Toast.makeText(FirstActivity.this, "单击了modify按钮", Toast.LENGTH_SHORT).show(); + } else if (item.getItemId() == R.id.delete_item) { + Toast.makeText(FirstActivity.this, "单击了delete按钮", Toast.LENGTH_SHORT).show(); + } + return true; + }); // 箭头函数（lambda表达式）——接口[只能有一个抽象函数] + popupMenu.show(); } }); + mFirstBtn2 = findViewById(R.id.first_btn2); mFirstBtn2.setOnClickListener(new View.OnClickListener() { @Override @@ -48,8 +82,43 @@ public class FirstActivity extends AppCompatActivity { Toast.makeText(FirstActivity.this, "我是严梓桐", Toast.LENGTH_SHORT).show(); } }); + + mFirstLinearLayout = findViewById(R.id.first_linear_layout); + registerForContextMenu(mFirstLinearLayout); } + // 弹出式菜单——触发事件 + + + // 上下文菜单 + // ctrl + shift + "+ / -": 展开、折叠代码块 + @Override + public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { + super.onCreateContextMenu(menu, v, menuInfo); + menu.setHeaderTitle("上下文菜单"); + // 参数1：分组号，参数2：item编号，参数3：顺序编号 + menu.add(1, 1, 1, "保存"); + menu.add(1, 2, 2, "更改"); + menu.add(1, 3, 3, "删除"); + } + + @Override + public boolean onContextItemSelected(@NonNull MenuItem item) { + if (item.getItemId() == 1) { + Toast.makeText(this, "人物简介——特长", Toast.LENGTH_SHORT).show(); + Log.d(TAG, "onContextItemSelected: 人物简介——特长"); + } else if (item.getItemId() == 2) { + Toast.makeText(this, "人物简介——战斗力", Toast.LENGTH_SHORT).show(); + Log.d(TAG, "onContextItemSelected: 人物简介——战斗力"); + } else if (item.getItemId() == 3) { + Toast.makeText(this, "人物简介——经典语录", Toast.LENGTH_SHORT).show(); + Log.d(TAG, "onContextItemSelected: 人物简介——经典语录"); + } + + return super.onContextItemSelected(item); + } + + // 选项菜单 @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); @@ -74,6 +143,7 @@ public class FirstActivity extends AppCompatActivity { /** * 添加一个按钮，id = first_btn2，完成单击事件：弹出Toast消息日志，内容自定义，带个人标识 + *

* mFirstBtn2 = findViewById(R.id.first_btn2); * mFirstBtn2.setOnClickListener(new View.OnClickListener() { * diff --git a/app/src/main/java/com/yanzitong/activitytest6117/SecondActivity.java b/app/src/main/java/com/yanzitong/activitytest6117/SecondActivity.java new file mode 100644 index 0000000..4995867 --- /dev/null +++ b/app/src/main/java/com/yanzitong/activitytest6117/SecondActivity.java @@ -0,0 +1,27 @@ +package com.yanzitong.activitytest6117; + +import android.content.Intent; +import android.os.Bundle; +import android.widget.Button; + +import androidx.annotation.Nullable; +import androidx.appcompat.app.AppCompatActivity; + +public class SecondActivity extends AppCompatActivity { + @Override + protected void onCreate(@Nullable Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + setContentView(R.layout.second_layout); + Button mSecondBtn1 = findViewById(R.id.second_btn1); + mSecondBtn1.setOnClickListener(v -> { + Intent intent = new Intent(SecondActivity.this, ThirdActivity.class); + startActivity(intent); + }); + } +} +/** + * your turn: + * 新建UI: third_layout和Java class: thirdActivity + * 按钮text = "跳转到ThirdActivity" + * 完成单击事件：实现从 SecondActivity 显式跳转到 ThirdActivity + */ \ No newline at end of file diff --git a/app/src/main/java/com/yanzitong/activitytest6117/ThirdActivity.java b/app/src/main/java/com/yanzitong/activitytest6117/ThirdActivity.java new file mode 100644 index 0000000..bf80d88 --- /dev/null +++ b/app/src/main/java/com/yanzitong/activitytest6117/ThirdActivity.java @@ -0,0 +1,46 @@ +package com.yanzitong.activitytest6117; + +import android.content.Intent; +import android.os.Bundle; +import android.widget.Button; + +import androidx.appcompat.app.AppCompatActivity; + +public class ThirdActivity extends AppCompatActivity { + + private Button mThirdBtn1; + private Button mThirdBtn2; + private Button mThirdBtn3; + + @Override + protected void onCreate(Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + setContentView(R.layout.third_layout); + + mThirdBtn1 = findViewById(R.id.third_btn1); + mThirdBtn1.setOnClickListener(v -> { // 项目内部隐式Intent：匹配action和category + Intent intent = new Intent("com.yanzitong.activitytest6117.action.YZT_FIRST"); // 为FirstActivity定义对应的action + intent.addCategory("com.yanzitong.activitytest6117.category.YZT_FIRST"); + startActivity(intent); + }); + + mThirdBtn2 = findViewById(R.id.third_btn2); + mThirdBtn3 = findViewById(R.id.third_btn3); + mThirdBtn2.setOnClickListener(v -> { + Intent intent = new Intent(Intent.ACTION_VIEW); // 等价于"Intent intent = new Intent(android.intent.action.VIEW)" + startActivity(intent); + }); + mThirdBtn3.setOnClickListener(v -> { + Intent intent = new Intent(); + startActivity(intent); + }); + } + + // 隐式Intent——项目内部或项目之间的调用 + // 1. 实现ThirdActivity返回FirstActivity + /** + * 为FirstActivity定义对应的action和category的值 + * category可以是默认值，不可缺 + * category自定义 + */ +} \ No newline at end of file diff --git a/app/src/main/res/layout/first_layout.xml b/app/src/main/res/layout/first_layout.xml index 996b157..da89aca 100644 --- a/app/src/main/res/layout/first_layout.xml +++ b/app/src/main/res/layout/first_layout.xml @@ -1,22 +1,37 @@ +